Magnetism and Electromagnetism, 1-2 ?· © Festo Didactic 91580–P0 21 ... ฀ Place the 2 bar magnets…

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  • Magnetism

    Festo Didactic 91580P0 19

    Magnetic Fields

    bar magnet.

    The drawing shows only a few of these lines. A practical magnet has many more.

    The lines near the magnets poles have the highest density (are closest together), so the magnetic force

    is strongest here.

    Midway between the poles, the lines are farthest apart, so the magnetic force here is

    a. strongest.

    b. weakest.

    c. independent of the distance from the poles.

    The lines of force for a horseshoe magnet are strongest where the poles are closest to each other.

  • Magnetism

    20 Festo Didactic 91580P0

    Weaker lines of force radiate outward between the poles.

    Additional weaker lines travel completely around the outside of the magnets shape.

    Their small size and weight and their magnetic properties allow a magnet to manipulate them easily.

  • Magnetism

    Festo Didactic 91580P0 21

    a. are repelled by the magnet.

    b. are attracted to the north pole only.

    c.

    board.

    Use the compass to identify the poles of both magnets. Which pole of each bar magnet attracts the north pole (colored end) of the compass needle?

    a. north

    b. south

  • Magnetism

    22 Festo Didactic 91580P0

    Hold one magnet in each hand, and slowly move the south pole of one magnet toward the north pole of the other.

    Can you feel a force acting on the magnets?

    a. yes

    b. no

    What type of force is present?

    a. attractive

    b. repulsive

    Move the magnets apart, and reverse one magnet so that the two north poles are facing each other. Again move the magnets together.

    What type of force do you feel now?

    a. attractive

    b. repulsive

    c. none

    What type of force would you feel if you brought the two south poles together?

    a. attractive

    b. repulsive

    c. none

  • Magnetism

    Festo Didactic 91580P0 23

    the bottom.

    Insert a bar magnet into the indentation on top of the container, and shake the container again.

    a. They are repelled by the magnet.

    b. They are attracted to the middle of the magnet.

    c. They are attracted to the magnets poles.

    a. A

    b. B

    c. C

    a.

    b. the magnets north pole

    c. the magnets south pole

    d.

  • Magnetism

    24 Festo Didactic 91580P0

    ELECTROMAGNETISM circuit board.

    Place the 2 bar magnets in the holding clips as shown, with the north pole of one magnet facing the south pole of the other.

  • Magnetism

    Festo Didactic 91580P0 25

    container over the 2 bar magnets. Position the container as shown so that the indentation

    a. A

    b. B

    The lines of force appearing along the length of each magnet represent

    a. a repulsive force.

    b.

    c.

  • Magnetism

    26 Festo Didactic 91580P0

    The lines of force between the north pole of one magnet and the south pole of the other represent a(n)

    a. attractive force.

    b. repulsive force.

    Remove the magnets, and place them in the remaining 2 clips as shown. Make sure the 2 south poles are facing each other.

  • Magnetism

    Festo Didactic 91580P0 27

    a. A

    b. B

    What type of force is shown between the 2 south poles?

    a. attractive

    b. repulsive

    a. The same type of force exists between similar poles and opposite poles.

    b. The type of force between magnets depends on whether the adjacent poles are similar or

    opposite.

    c.

  • Magnetism

    28 Festo Didactic 91580P0

    The magnetic force is strongest near the magnet's poles.

    or opposite.

    1.

    a. a compass.

    b. a third magnet.

    c. two other magnets.

    d.

    2. Suppose 4 bar magnets were aligned as shown (with all 4 south poles facing the center).

    a. A

    b. B

    c. C

    d. D

  • Magnetism

    Festo Didactic 91580P0 29

    3.

    a. north to north

    b. south to south

    c. north to south

    d. cannot be determined

    4.

    a. A

    b. B

    c. C

    d. D

    5.

    the highlighted area?

    a. attractive

    b. repulsive

    c. attractive and repulsive

    d. None, the attractive and repulsive forces cancel each other.