Magnetic Fields

When you break a bar magnet into two pieces, you get _________________.

• two south poles

• a piece of iron that is no longer a magnet

• two north poles

• two north poles and two south poles

The picture below shows a piece of iron before it has become magnetized.  What will the domains (groups of atoms) look like after it is magnetized?

• None of the above.

• They will all line up in the same direction.

• Half of them will line up in one direction and the other half will line up in the other direction.

• They will look the same.

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The space around an object in which magnetic forces can act on objects is known as

• its magnetic poles.

• the magnetic field.

• the attraction force.

• the force of repulsion.

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Based on the magnetic field line diagrams, what will happen next with these two sets of magnets?

• The magnets in Set 1 will attract, and the magnets in Set 2 will repel.

• In both sets, the magnets will attract.

• The magnets in Set 1 will repel, and the magnets in Set 2 will attract.

• The magnets in Set 1 will not move, and the magnets in Set 2 will attract.

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Abdul moves a magnetic toy train away from a magnet that cannot move. What happens to the potential energy in the system of magnets during the movement?

• The potential energy does not change because the magnets in the system do not change.

• The potential energy decreases because the train moves in the same direction as the magnetic force.

• The potential energy decreases because the train moves against the magnetic force.

• The potential energy increases because the train moves against the magnetic force.

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An engineer is investigating potential energy with two identical magnetic roller coaster cars on different sides of a center magnet that cannot move. To test her ideas, the engineer will move one car one space. Which movement will result in the largest increase in potential energy?

• Moving Car 2 one space toward the center magnet.

• All these movements will result in the same change in potential energy because they each move a roller coaster car the same distance.

• Moving Car 2 one space away from the center magnet.

• Moving Car 1 one space toward the center magnet.

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Based on the magnetic field line diagrams, what will happen next with these sets of magnets?

• The magnets in Set 1 will attract, and the magnets in Set 2 will not move.

• The magnets in Set 1 will repel, and the magnets in Set 2 will attract.

• In both sets, the magnets will attract.

• The magnets in Set 1 will attract, and the magnets in Set 2 will repel.

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An engineer is experimenting with two identical magnetic roller coaster cars on different sides of a center magnet that cannot move. The engineer is planning to move one car one space. Which movement will result in the largest increase in potential energy?

• Moving Car 1 one space toward the center magnet.

• Moving Car 2 one space away from the center magnet.

• All these movements will result in the same change in potential energy because they each move a roller coaster car the same distance.

• Moving Car 1 one space away from the center magnet.

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Which pole does the magnetic field go into?

• North

• South

• Both north and south

• Neither north or south

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Shanika is an engineer at an amusement park who is experimenting with changes to the setup for a magnetic roller coaster ride. In one ride, there are two identical roller coaster cars (orange and green) that start on opposite sides of a large magnet located at the center of a station. Shanika wants to get the largest increase in potential energy she can by moving one car one space to the left or the right.

Shanika can move the orange car to point A or point B, or she can move the green car to point C or point D. Which movement should she make? Why will that movement result in the largest increase in potential energy? Describe the magnetic force that will act on the roller coaster car she moves.

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