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Magnetism and Electromagnetism Quest Name: 1) An electron is moving to the right in a region where a uniform magnetic force exerted on the electron will be 2) A wire carries electric current out of the page as shown in the 3) A positive charge q is moving with a velocity v perpendicular B What are the magnitude and direction of the that Each of the following multiple choice questions is worth two points, for a total of 42 points on this section. B Magnitude Direction (A) qvB (B) B/v (C) Bv right (D) Bv down (E) Bv out of paper 6) Two wires carrying equal currents are perpendicular to each (A) A (B) B (C) C (D) D (E) None of these regions

Magnetism and Electromagnetism Quest Name€¦ · Magnetism and Electromagnetism Quest Name: 1) An electron is moving to the right in a region where a uniform magnetic force exerted

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Page 1: Magnetism and Electromagnetism Quest Name€¦ · Magnetism and Electromagnetism Quest Name: 1) An electron is moving to the right in a region where a uniform magnetic force exerted

Magnetism and Electromagnetism Quest Name:

1) An electron is moving to the right in a region where a uniform

magnetic force exerted on the electron will be

2) A wire carries electric current out of the page as shown in the

3) A positive charge q is moving with a velocity v perpendicular B

What are the magnitude and direction of the that

Each of the following multiple choice questions is worth two points, for a total of 42 points on this section.

B

Magnitude Direction (A) qvB (B) B/v (C) Bv right (D) Bv down (E) Bv out of paper

6) Two wires carrying equal currents are perpendicular to each

(A) A (B) B (C) C (D) D (E) None of these regions

Page 2: Magnetism and Electromagnetism Quest Name€¦ · Magnetism and Electromagnetism Quest Name: 1) An electron is moving to the right in a region where a uniform magnetic force exerted

10) A rectangular loop of wire is moving toward a long current-carrying wire as shown above. In which direction

directed

14) A conducting rail of mass m and length L slides vertically along frictionless rails connected by a resistor of resistance

B is directed into the page, as shown. When the rail has reached terminal speed vT, the current through the resistor is

(A) mgvT (B) BLvT/R (C) B2L2vT/R (D) BLvT (E) mg/BL

15) When the rail above has reached terminal speed vT, the power output of the resistor is

(A) mgvT (B) BLvT/R (C) B2L2vT/R (D) BLvT (E) mg/BL

12) Which one of the identical charged particles shown below will experience the greatest magnitude of magnetic force?

(A) 1 (B) 2 (C) 3 (D) 4 (E) 5

13) A positively charged particle is

to the right. Which path will it make?

Page 3: Magnetism and Electromagnetism Quest Name€¦ · Magnetism and Electromagnetism Quest Name: 1) An electron is moving to the right in a region where a uniform magnetic force exerted

19) Two parallel wires, each carrying a current I, repel each other with a force F. If both currents are doubled, the force of repulsion is

(A) 2F (B) F (C) 4F (D) F (E) 8F21) Two long, parallel wires are separated by a

distance d, as shown above. One wire carries a steady current I into the plane of the page while the other wire carries a steady current I out of the page. At what points in the plane of the page and outside the wires, besides points at infinity, is the magnetic field due to the currents zero?

(A) Only at point P(B) At all points on the line SS'(C) At all points on the line connecting the wires(D) At all points on a circle of radius 2d centered on point P(E) At no points

!20) In the scenario shown, a positively charged particle is in motion near a current-carrying wire. At the instant shown, the wire and the particle are both in the plane of the page, and the particle is moving into the page. At this instant, what is the direction of the magnetic force exerted on the particle?

(A) upward (B) downward (C) left (D) right (E) into page (F) out of page

!

A particle with unknown mass and charge moves with constant speed v = 1.9 × 106 m/s as it passes undeflected through a pair of parallel plates, as shown above. The plates are separated by a distance d = 6.0 × 10-3 m, and a constant potential difference V is maintained between them. A uniform magnetic field of magnitude B = 0.20 T directed into the page exists both between the plates and in a region to the right of them as shown. After the particle passes into the region to the right of the plates where only the magnetic field exists, its trajectory is circular with radius r = 0.10 m.

22)

(a) What is the sign of the charge of the particle? Justify your answer. (3 pts)

(b) On the diagram above, clearly indicate the direction of the electric field between the plates. (2 pts)

(c) Determine the magnitude of the electric field between the plates. (3 pts)

(d) Determine the ratio of the charge to the mass (q/m) of the particle. (4 pts)

(e) If the particle were initially traveling slower than 1.9 × 106 m/s, what would happen to it? Explain your answer. (3 pts)

Page 4: Magnetism and Electromagnetism Quest Name€¦ · Magnetism and Electromagnetism Quest Name: 1) An electron is moving to the right in a region where a uniform magnetic force exerted

on a horizontal surface. Attached to the cart is a rigid rectangular loop of wire that is 0.10 m by 0.20 m, has resistance 4.0 Ω, and has a mass that is negligible compared to the mass of the cart. �e plane of the rectangular loop is parallel to the plane of the page. A uniform magnetic �eld of 2.0 T, perpendicular to and directed into the plane of the page, starts at x = 0, as shown above.

x = 0.12 m. (4 pts)

Justify your answer.

b) When the front edge of the rectangular loop is at x = 0.12 m, its speed is 3.0 m/s. Calculate the following for that instant. (6 points)

net force on the loop at that time. Justify your answer. (5 points)

0 0.10 0.20 0.30 0.40 0.50 0.60

!

23) (15 points)

Page 5: Magnetism and Electromagnetism Quest Name€¦ · Magnetism and Electromagnetism Quest Name: 1) An electron is moving to the right in a region where a uniform magnetic force exerted

24) A 20-turn wire coil in the shape of a rectangle, 0.25 m by 0.15 m, has a resistance of 5.0 Ω. In position 1 shown above, the loop is in a uniform magnetic field B of 0.20 T. The field is directed out of the page, perpendicular to the plane of the loop. The loop is pulled to the right at a constant velocity, reaching position 2 in 0.50 s, where B is equal to zero.

(a) Calculate the initial magnetic flux through the loop. (3 pts)

b) Calculate the average emf induced in the 20-turn coil during this period. (3 pts)

(c) Calculate the magnitude of the current induced in the 20-turn coil and state its direction. (4 pts)

(c) Calculate the power dissipated in the 20-turn coil. (3 pts)

(d) Identical wire is used to add 20 more turns of wire to the original coil. How does this affect the current in the coil? Be quantitative and justify your answer. (5 pts)