Regents Review for E-Statics, Circuits, & Magnetism

Regents Review for E-Statics, Circuits, & Magnetism

A) a positive chargeB) a negative chargeC) an unknown chargeD) no charge

1. In the diagram below, a cloth is brought near, butdoes not touch a neutral electroscope. Theelectroscope leaves separate. What charge, if any,does the cloth have?

A) positive and the leaves are positiveB) positive and the leaves are negativeC) negative and the leaves are positiveD) negative and the leaves are negative

2. As shown in the diagram below, a charged rod is heldnear, but not touching, a neutral electroscope.

The charge on the knob is

A)

B)

C)

D)

3. Which diagram shows the leaves of the electroscopethat has already been charged positively byinduction?

A) gained 100 electronsB) gained 100 protonsC) lost 100 electronsD) lost 100 protons

4. Two objects, A and B are rubbed together. If object A acquires an excess of 100 electrons object B musthave

A) 8.0 × 10–11 C B) 8.0 × 10–6 CC) 2.1 × 10–6 C D) 1.2 × 10–5 C

5. Two metal spheres having charges of +4.0 × 10–6 coulomb and +2.0 × 10–5 coulomb, respectively, arebrought into contact and then separated. Afterseparation, the charge on each sphere is

A) electrons are transferred from the wool to the rodB) protons are transferred from the wool to the rodC) electrons are transferred from the rod to the woolD) protons are transferred from the rod to the wool

6. When a plastic rod is rubbed with wool, the woolacquires a positive charge because

7. Base your answer to the following question on the diagram below which represents a systemconsisting of two charged metal spheres with equalradii.

A) 1/2 as great B) 2 times as greatC) 1/4 as great D) 4 times as great

Compared to the force exerted on sphere B at aseparation of 12 meters, the force exerted on sphere B at a separation of 6.0 meters would be

A) –2 elementary chargesB) +2 elementary chargesC) elementary chargeD) elementary charge

8. After a neutral object loses 2 electrons, it will have anet charge of

Base your answers to questions 9 and 10 on the diagram below and on your knowledge of physics.The diagram represents two small, charged, identical metal spheres, A and B that are separated by adistance of 2.0 meters.

A) B)C) D)

9. If the two spheres were touched together and then separated, the charge on sphere A would be

A) B)C) D)

10. What is the magnitude of the electrostatic force exerted by sphere A on sphere B?

Base your answers to questions 11 through 15 on the diagram below which shows two identical metalspheres. Sphere A has a charge of +12 coulombs and sphere B is a neutral sphere.

A) gain 6 coulombs of protons B) lose 6 coulombs of protonsC) gain 6 coulombs of electrons D) lose 6 coulombs of electrons

11. When spheres A and B come into contact, sphere B will

A) +12 coulombs B) 1/4 the original amountC) 1/2 the original amount D) 4 times the original amount

12. When spheres A and B are separated, the charge on A will be

A) neutral B) +6 C C) +12 C D) +24 C

13. When spheres A and B are in contact, the total charge of the system is

A) B)

C) D)

14. After spheres A and B are separated, which graph best represents the relationship of the forcebetween the spheres and their separation?

A) decreases B) increasesC) remains the same

15. After contact, the spheres are moved apart. As the distance between the spheres is increased, theelectric potential energy of the system

A) strong B) weakC) gravitational D) electromagnetic

16. Which fundamental force is primarily responsiblefor the attraction between protons and electrons?

A) 8.0 × 10–19 C B) 4.8 × 10–19 CC) 3.2 × 10–19 C D) 2.6 × 10–19 C

17. Oil droplets may gain electrical charges as they areprojected through a nozzle. Which quantity ofcharge is not possible on an oil droplet?

A) 9.11 × 10–31 C B) 1.60 × 10–19 CC) 9.00 × 109 C D) 6.25 × 1018 C

18. What is the smallest electric charge that can be puton an object? A) A

B) BC) CD) DE) it won't move because it is neutral

19. In the diagram below a negatively charged rodapproaches a neutral pith ball. In which directionwill the pith ball first move?

A) A, only B) B, onlyC) both A and B D) neither A nor B

20. The diagram below represents two electricallycharged identical-sized metal spheres, A and B.

If the spheres are brought into contact, which spherewill have a net gain of electrons?

A) the same B) two times as greatC) one-half as great D) four times as great

21. If the charge on each of two small charged metalspheres is doubled and the distance between thespheres remains fixed, the magnitude of the electricforce between the spheres will be

Base your answers to questions 22 and 23 on theinformation and diagram below.

Two small metallic spheres, A and B, areseparated by a distance of 4.0 × 10–1 meter, asshown. The charge on each sphere is +1.0 × 10–6 coulomb. Point P is located near the spheres.

A) B)

C) D)

22. Which arrow best represents the direction of theresultant electric field at point P due to the chargeson spheres A and B?

A) 2.2 × 10–2 N B) 5.6 × 10–2 NC) 2.2 × 104 N D) 5.6 × 104 N

23. What is the magnitude of the electrostatic forcebetween the two charged spheres?

A) sphere A B) sphere BC) sphere C D) no sphere

24. The diagram below shows the arrangement of threecharged hollow metal spheres, A, B, and C. Thearrows indicate the direction of the electric forcesacting between the spheres. At least two of thespheres are positively charged.

Which sphere, if any, could be negatively charged?

A) B)

C) D)

25. Which diagram best represents the electric fieldaround a negatively charged conducting sphere?

A) B)

C) D)

26. Which diagram represents the electric field between two oppositely charged conducting spheres?

A) Both forces are attractive.B) Both forces are repulsive.C) The gravitational force is repulsive and the

electrostatic force is attractive.D) The gravitational force is attractive and the

electrostatic force is repulsive.

27. Two positively charged masses are separated by adistance, r. Which statement best describes thegravitational and electrostatic forces between thetwo masses?

A) Sphere A is positive and sphere B is negative.B) Sphere A is negative and sphere B is positive.C) Both spheres are positive.D) Both spheres are negative

28. The diagram below represents the electric fieldsurrounding two charged spheres. A and B.

What is the sign of the charge of each sphere?

A)

B)

C)

D)

29. In the diagram below, two positively chargedspheres, A and B, of masses mA and mB are located adistance d apart.

Which diagram best represents the directions of thegravitational force, Fg, and the electrostatic force, Fe, acting on sphere A due to the mass and charge ofsphere B? [Vectors are not drawn to scale.]


30. An electron is placed between two oppositelycharged parallel plates as shown in the diagrambelow.

As the electron moves toward the positive plate, themagnitude of the electric force acting on the electron

31. Base your answer to the following question on the diagram below which represents two large parallelconducting plates charged to a potential of 10. volts. The plates are separated by a distance of 0.050meter.

A) less and directed upwards B) greater and directed upwardsC) the same and directed upwards D) the same and directed downwardsE) greater and directed downwards F) less and directed downwards

Compared to the magnitude of the electric force on the electron at point P , the magnitude of theelectric force on the electron at point A is

A) toward plate A B) toward plate BC) into the page D) out of the page

32. An electron placed between oppositely chargedparallel plates A and B moves toward plate A, asrepresented in the diagram below

What is the direction of the electric field between theplates?

Base your answers to questions 33 and 34 on the diagram below which shows two parallel metalplates A and B connected to a voltage source.

A) decrease B) increaseC) remain the same

33. If only the distance between the plates is increased,the electric field intensity between the plates will


34. If only the original source voltage is increased, theelectric field intensity between the plates will

Base your answers to questions 35 through 38 on the diagram below which represents a voltage sourceconnected to two large, parallel metal plates. Theelectric field intensity between the plates is

Newtons per coulomb.


35. As a proton moves from A to B to C, the electricforce on the proton

A) B)C) D)

36. What is the potential difference of the source?

A) B)C) 0 N D)

37. What would be the magnitude of the electric forceon a proton at point A?


38. If the source is replaced with one having twice thepotential difference and the distance between theplates is halved, the electric field intensity betweenthe plates will

A) into the pageB) out of the pageC) toward the bottom of the pageD) toward the top of the page

39. A beam of electrons is directed into the electric fieldbetween two oppositely charged parallel plates, asshown in the diagram below.

The electrostatic force exerted on the electrons bythe electric field is directed

A) neutron, because it has the greatest massB) neutron, because it is neutralC) electron, because it has the smallest massD) proton, because it is farthest from the negative

plate

40. In the diagram below, proton p, neutron n, andelectron e are located as shown between twooppositely charged plates.

The magnitude of acceleration will be greatest forthe

A) B)

C) D)

41. Two plastic rods, A and B. each possess a netnegative charge of 1.0 x 10–3 coulomb. The rods anda positively charged sphere are positioned as shownbelow.

Which vector best represents the resultantelectrostatic force on the sphere?

A) 2.00 × 104 N/C directed away from the sphereB) 2.00 × 104 N/C directed toward the sphereC) 5.00 × 10–5 N/C directed away from the sphereD) 5.00 × 10–5 N/C directed toward the sphere

42. A 3.00 × 10–9-coulomb test charge is placed near anegatively charged metal sphere. The sphere exertsan electrostatic force of magnitude 6.00 × 10–5 newton on the test charge. What is the magnitudeand direction of the electric field strength at thislocation?

A) 2.0 × 10–5 N/C B) 2.0 × 105 N/CC) 5.0 × 10–5 N/C D) 5.0 × 105 N/C

43. The diagram below, which illustrates the Millikanoil drop experiment, shows a 3.2 × 10–14 -kilogramoil drop with a charge of-1.6 × 10–18 coulomb. Theoil drop was in equilibrium when the upward electricforce on the drop was equal in magnitude to thegravitational force on the drop.

What was the magnitude of the electric fieldintensity when this oil drop was in equilibrium?

Base your answers to questions 44 and 45 on theaccompanying diagram which represents two largeparallel plates which are oppositely charged. A, B,and C are reference points.


44. If an electron moves from point A to point B, theelectron's electric potential energy will


45. If an electron is moved from point A to point C, thepotential energy of the electron will

A) 1.6 × 10–9 V B) 4.0 × 10–3 VC) 2.5 × 102 V D) 1.0 × 1014 V

46. Moving 2.5 × 10–6 coulombs of charge from point A to point B in an electric field requires 6.3 × 10–4 joules of work. The potential difference betweenpoints A and B is approximately

A) B)

C) D)

47. In the diagrams of charged objects shown below,which diagram correctly represents the direction offlow of electrons when the objects are connected bya conductor?

A) nuclei B) protonsC) neutrons D) electrons

48. An electric current in a metal consists of moving

A) a potential differenceB) a magnetic fieldC) a low resistanceD) a high resistance

49. Which condition must exist between two points in aconductor in order to maintain a flow of charge?

A) 120 A B) 2.0 AC) 0.50 A D) 0.0083 A

50. What is the current through a wire if 240 coulombsof charge pass through the wire in 2.0 minutes?

A) 2.50 × 1013 A B) 6.25 × 105 AC) 4.00 × 10–3 A D) 2.50 × 10–3 A

51. Charge flowing at the rate of 2.50 × 1016 elementarycharges per second is equivalent to a current of

A) 1.7 × 10–4A B) 2.4 × 10–2AC) 6.0 × 103 A D) 9.6 × 103 A

52. During a thunderstorm, a lightning strike transfers12 coulombs of charge in 2.0 × 10–3 second. What isthe average current produced in this strike?

A) coulomb per secondB) ohm per voltC) joule per coulombD) Newton per coulomb

53. An ampere can be defined as one

A) directly with length and inversely withcross-sectional area

B) inversely with length and directly withcross-sectional area

C) directly with both length and cross-sectionalarea

D) inversely with both length and cross-sectionalarea

54. A manufacturer recommends that the longer theextension cord used with an electric drill, the thicker(heavier gauge) the extension cord should be. Thisrecommendation is made because the resistance of awire varies

Base your answers to questions 55 through 57 on the accompanying graph which shows the datacollected for a copper wire at a constant temperature.


55. If the length of the copper wire being tested isdecreased, its total resistance will

A) B)C) D)

56. When the voltage is volts, the rate at whichenergy is being supplied to the wire isapproximately

A) B)C) D)

57. The resistance of the wire is closest to


58. The diagram below represents a lamp, a 10-voltbattery, and a length of nichrome wire connected inseries.

As the temperature of the nichrome is decreased, thebrightness of the lamp will

A) replacing the wire with a thicker copper wire ofthe same length

B) replacing the wire with a longer copper wire ofthe same thickness

C) increasing the temperature of the copper wireD) increasing the potential difference supplied by

the battery

59. The diagram below shows a circuit in which acopper wire connects points A and B.

The electrical resistance between points A and B canbe decreased by

A) The ammeter reading decreases.B) The ammeter reading increases.C) The voltmeter reading decreases.D) The voltmeter reading increases.

60. The diagram below represents a simple circuitconsisting of a variable resistor, a battery, anammeter, and a voltmeter.

What is the effect of increasing the resistance of thevariable resistor from 1000 to 10000 ?[Assume constant temperature.]

A) 250 mA B) 40. mAC) 2.5 mA D) 4.0 mA

61. What is the current in a 100.-ohm resistor connectedto a 0.40-volt source of potential difference?

A)

B)

C)

D)

62. Which graph best represents the relationshipbetween the power expended by a resistor that obeysOhm's Law and the potential difference applied tothe resistor?

Base your answers to questions 63 through 65 on thediagram below.

A) 0.500 W B) 2.00 WC) 3.00 W D) 4.00 W

63. What is the total resistance of the circuit?

A) 24.0 W B) 90.0 WC) 3.00 W D) 192 W

64. What power is supplied by the source?

A) 8.00 A B) 2.00 AC) 16.0 A D) 4.00 A

65. What is the current in resistor R2?

A) 160 V B) 80. VC) 40. V D) 20. V

66. In the circuit shown below, voltmeter V2 reads 80.volts.

What is the reading of voltmeter V1?

A) 50 B) 100 C) 150 D) 200

67. A 100.-ohm resistor and an unknown resistor areconnected in series to a 10.0-volt battery. If thepotential drop across the 100.-ohm resistor is 4.00volts, the resistance of the unknown resistor is

A) 6.0 B) 9.0 C) 3.0 D) 12

68. The diagram below represents an electric circuitconsisting of a 12-volt battery, a 3.0-ohm resistor, R1, and a variable resistor, R2.

At what value must the variable resistor be set toproduce a current of 1.0 ampere through R1?

A) The potential difference across the 6-ohmresistor is the same as the potential differenceacross the 3-ohm resistor.

B) The potential difference across the 6-ohmresistor is twice as great as the potentialdifference across the 3-ohm resistor.

C) The potential difference across the 6-ohmresistor is half as great as the potentialdifference across the 3-ohm resistor.

D) The potential difference across the 6-ohmresistor is four times as great as the potentialdifference across the 3-ohm resistor.

69. A 3-ohm resistor and a 6-ohm resistor are connectedin parallel across a 9-volt battery. Which statementbest compares the potential difference across eachresistor?

A) V1 reads 2.0 V and V2 reads 4.0 VB) V1 reads 4.0 V and V2 reads 2.0 VC) V1 reads 3.0 V and V2 reads 3.0 VD) V1 reads 6.0 V and V2 reads 6.0 V

70. In the circuit diagram below, what are the correctreadings of voltmeters V1 and V2?

Base your answers to questions 71 through 75 on theelectric circuit below. The switch is in the openposition.

A) less B) greaterC) the same

71. Compared to the potential drop across the 10.-ohmresistor, the potential drop across the resistoris

A) 600 watts B) 360 wattsC) 60. watts D) 6.0 watts

72. What power is developed in the 10.-ohm resistor?

A) 1/6 ampere B) 6.0 amperesC) 60. amperes D) 600 amperes

73. What is the reading of ammeter A1?

A) 9.0 amperes B) 2.0 amperesC) 12 amperes D) 18 amperes

74. What is the reading of ammeter A2?

A) less B) greaterC) the same

75. Compared to the current passing through ammeter A1 when the switch is open, the current passingthrough ammeter A1 when the switch is closed willbe

A)

B)

C)

D)

76. Which combination of resistors has the smallest equivalent resistance?

A) B)

C) D)

77. In which circuit would ammeter A show the greatest current?

A) 1 A B) 2 A C) 3 A D) 4 A

78. The diagram below represents currents in a segmentof an electric circuit.

What is the reading of ammeter A? A) 1.0 A B) 2.0 A C) 3.0 A D) 5.0 A

79. Ammeters A1, A2 and A3 are placed in a circuit asshown below.

What is the reading on ammeter A3?

A) 5 A B) 7 A C) 3 A D) 8 A

80. Three ammeters are located near junction P in adirect current circuit as shown in the diagram below.

If ammeter Al reads 3 amperes and ammeter A2 reads4 amperes, then what does ammeter A3 read?

81. Base your answer to the following question on thediagram below which represents two resistances (R1 and R2) and an ammeter connected to a constant 30.volt source. The combined resistance of the circuit is6.0 ohms.


If the resistance of R2 were increased, the currentthrough R1 would

A) ammeter at 1 and voltmeter at 4B) ammeter at 2 and voltmeter at 3C) ammeter at 3 and voltmeter at 4D) ammeter at 1 and voltmeter at 2

82. In the electric circuit diagram below, possiblelocations of an ammeter and a voltmeter areindicated by circles 1, 2, 3, and 4

Where should an ammeter be located to correctlymeasure the total current and where should avoltmeter be located to correctly measure the totalvoltage?

A) 1 B) 2 C) 3 D) 4

83. Two resistors are connected to a source of voltage asshown in the diagram below.

At which position should an ammeter be placed tomeasure the current passing only through resistor R1?

A) B)

C) D)

84. In the circuits represented below, the symbol for theammeter is A and the symbol for the voltmeter is V.Which diagram represents the proper connectionsfor determining the resistance of the circuit?

A) in parallel with the circuit resistorB) in series with the circuit resistorC) before connecting the other circuit componentsD) after connecting the other circuit components

85. A student uses a voltmeter to measure the potentialdifference across a circuit resistor. To obtain acorrect reading, the student must connect thevoltmeter

A) less resistance and draws more currentB) less resistance and draws less currentC) more resistance and draws more currentD) more resistance and draws less current

86. To increase the brightness of a desk lamp, a studentreplaces a 50-watt incandescent lightbulb with a100-watt incandescent lightbulb. Compared to the50-watt lightbulb, the 100-watt lightbulb has

A) 0.018 A B) 5.3 AC) 19 A D) 56 A

87. A 3.6-volt battery is used to operate a cell phone for5.0 minutes. If the cell phone dissipates 0.064 wattof power during its operation, the current that passesthrough the phone is

A) B)

C) D)

88. The potential difference applied to a circuit elementremains constant as the resistance of the element isvaried. Which graph best represents the relationshipbetween power (P) and resistance (R) of thiselement?


89. As the resistance of a lamp operating at a constantvoltage increases, the power dissipated by the lamp

90. Base your answer to the following question on the diagram below which represents two resistances(R1 and R2) and an ammeter connected to a constant30. volt source. The combined resistance of thecircuit is 6.0 ohms.

A) 60. W B) 90. WC) 150 W D) 250 W

What power is developed in resistor R1 alone?

A) B)C) D)

91. The total amount of electrical energy used by a315-watt television during 30.0 minutes of operationis

A) 5.0 V B) 12 VC) 60. V D) 300 V

92. If 3.75 x 10 20 evs are required to move 5.0coulombs of charge between two points in anelectric field, what is the potential differencebetween these points?

A)B)C) volt•coulombD) volt•coulomb•second

93. Which combination of units can be used to expresselectrical energy?

A) 6.0 eV B) 2.0 eVC) 3.0 eV D) 12 eV

94. How much work is done in moving 6 electronsthrough a potential difference of 2.0 volts?

95. Base your answer to the following question on thediagram below which shows two large parallel metalplates connected to a source of electric potential. Theplates are meter apart and the potentialdifference across the plates is 100 volts.

A) B)C) D)

As an electron moves from plate A to plate B howmuch work is done on the electron?

A) B)C) D)

96. An energy of 13.6 electron-volts is equivalent to

A) N/m2 B) Wb/m2

C) C/m2 D) J/m2

97. Magnetic Field Strength (aka flux density) may bemeasured in

A) A B) B C) C D) D

98. The diagram below represents the magnetic lines offorce around a bar magnet.

At which point is the magnitude of the magneticfield strength of the bar magnet the greatest?

A) A B) B C) C D) D

99. The diagram below represents magnetic lines offorce within a region of space.

The magnetic field is strongest at point

A) B)

C) D)

100. A compass is located at point X near a bar magnetas shown in the diagram below. Which diagrambest represents the position of the compass needleas it responds to the magnetic field located at x.

A) B)

C) D)

101. The diagram below represents the magnetic fieldnear point P.

If a compass is placed at point P in the same planeas the magnetic field, which arrow represents thedirection the north end of the compass needle willpoint?

A) The gravitational force is attractive and themagnetic force is repulsive.

B) The gravitational force is repulsive and themagnetic force is attractive.

C) Both the gravitational force and the magneticforce are attractive.

D) Both the gravitational force and the magneticforce are repulsive.

102. When two ring magnets are placed on a pencil,magnet A remains suspended above magnet B, asshown below.

Which statement describes the gravitational forceand the magnetic force acting on magnet A due tomagnet B?

A)

B)

C)

D)

103. Which diagram best represents magnetic flux linesaround a bar magnet?

A) stationary chargeB) small massC) beam of neutronsD) magnetic compass

104. The presence of a uniform magnetic field may bedetected by using a

A) an electric field, onlyB) a magnetic field, onlyC) both an electric field and a magnetic fieldD) neither an electric field nor a magnetic field

105. Which type of field is present near a movingelectric charge?

A) moving and chargedB) moving and neutralC) stationary and chargedD) stationary and neutral

106. Magnetic fields are produced by particles that are

A) B)

C) D)

107. Which diagram best illustrates the magnetic fieldthat exists around a current-carrying wire?

A) B)

C) D)

108. Each diagram below represents a cross section of along, straight, current-carrying wire with theelectron flow into the page. Which diagram bestrepresents the magnetic field near the wire?

A) stationary B) movingC) positive D) negative

109. In order to produce a magnetic field, an electriccharge must be

A) B)

C) D)

110. In the diagram below, steel paper clips A and B areattached to a string, which is attached to a table.The clips remain suspended beneath a magnet.

Which diagram best represents the induced polarityof the paper clips?

A) B)

C) D)

111. An electron traveling at a speed (V) in the plane ofthis paper enters a uniform magnetic field. Whichdiagram best represents the condition under whichthe electron will experience the greatest magneticforce as it enters the magnetic field?

A) 0º B) 45º C) 90º D) 180º

112. An electron moving in a uniform magnetic fieldexperiences the maximum magnetic force when theangle between the direction of the electron's motionand the direction of the magnetic field is

A) a gravitational field, onlyB) an electric field, onlyC) a magnetic field, onlyD) both an electric field and a magnetic field

113. Charged particles can be accelerated by

Base your answers to questions 114 through 116 onthe information and graph below.

A student conducted an experiment todetermine the resistance of a lightbulb. As sheapplied various potential differences to the bulb,she recorded the voltages and correspondingcurrents and constructed the graph below.

114. While performing the experiment the studentnoticed that the lightbulb began to glow andbecame brighter as she increased the voltage. Ofthe factors affecting resistance, which factor causedthe greatest change in the resistance of the bulbduring her experiment?

A) decreasedB) increasedC) changed, but there is not enough information

to know which way

115. According to the graph, as the potential differenceincreased, the resistance of the lightbulb

116. The student concluded that the resistance of thelightbulb was not constant. What evidence from thegraph supports the student’s conclusion?

117. Base your answer to the following question on Thediagram below shows proton P located at point A near a positively charged sphere.

If 6.4 ×10–19 joule of work is required to move theproton from point A to point B, the potentialdifference between A and B is

118. Base your answer to the following question on theinformation below.

A 3.50-meter length of wire with acrosssectional area of 3.14 x 10-6 meter2 is at20° Celsius. The current in the wire is 24.0amperes when connected to a 1.50-volt sourceof potential difference.

Calculate the resistivity of the wire. [Show allwork, including the equation and substitution withunits.]

119. Base your answer to the following question on the information and diagram below.

Two small charged spheres, A and B, are separated by a distance of 0.50 meter. The charge onsphere A is -2.4 ×10-6 coulomb and the charge on sphere B is +2.4 ×10-6 coulomb.

On the diagram, sketch three electric field lines to represent the electric field in the region betweensphere A and sphere B. [Draw an arrowhead on each field line to show the proper direction.]

120. Base your answer to the following question on the information below.

A 5.0-ohm resistor, a 10.0-ohm resistor, and a 15.0-ohm resistor are connected inparallel with a battery. The current through the 5.0-ohm resistor is 2.4 amperes.Calculate the amount of electrical energy expended in the 5.0-ohm resistor in 2.0 minutes. [Show allwork, including the equation and substitution with units.]- 2 Point Response

121. Calculate the resistance of a 900.-watt toasteroperating at 120 volts. [Show all work, includingthe equation and substitution with units.]

122. On the diagram below, sketch at least four electricfield lines with arrowheads that represent theelectric field around a negatively chargedconducting sphere.

Base your answers to questions 123 through 125 onthe information and diagram below.

A 15-ohm resistor R1, and a 30-ohm resistor, R2, are to be connected in parallel between points A and B in a circuit containing a 90-volt battery.

123. Complete the diagram above, to show the tworesistors connected in parallel between points A and B.

124. Determine the potential difference across resistor R1.

125. Calculate the current in resistor R 1. [Show allwork, including the equation and substitution withunits.]

126. Base your answer to the following question on theinformation and diagram below.

A 10.0-meter length of copper wire is at20ºC. The radius of the wire is 1.0 × 10-3 meter.

Calculate the resistance of the wire. [Show allwork, including the equation and substitution withunits.]

127. The diagram below represents a wire conductor, RS, positioned perpendicular to a uniform magneticfield directed into the page.

Describe the direction in which the wire could bemoved to produce the maximum potentialdifference across its ends, R and S.

128. The circuit shown below contains two resistors, R 1 and R 2 .

a What is the resistance of resistor R 2 ?[Show all calculations, including the equation and substitution with units.]

b What is the power of this circuit?[Show all calculations, including the equation and substitution with units.]

Base your answers to questions 129 and 130 on the information and diagram below.

Two parallel plates separated by a distance of 2.0 x 10- 2 meter are charged to a potentialdifference of 1.0 x 102 volts. Points A, B, and C are located in the region between theplates.

129. Calculate the magnitude of the electric field strength between the plates. [Show all calculations,including the equation and substitutions with units.]

130. On the diagram, sketch the electric field lines between the oppositely charged parallel plates throughpoints A, B, and C. [Draw lines with arrowheads in the proper direction.]

Base your answers to questions 131 through 133 on the information below.

A 5.0-ohm resistor, a 20.0-ohm resistor, and a 24-volt source of potential difference areconnected in parallel. A single ammeter is placed in the circuit to read the total current.

131. Draw a diagram of this circuit, using the symbols and labels from your Reference Table.[Assume availability of any number of wires of negligible resistance.]

132. Determine the total circuit resistance. [Show all calculations, including the equation and substitutionwith units.]

133. Determine the total circuit current. [Show all calculations, including the equation and substitutionwith units.]

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Regents Review for E-Statics, Circuits, & Magnetism