Magnetism and Electromagnetism Review

When is an object magnetic?

• when it only has a north pole

• when it only has a south pole

• when it is free to rotate

• when it attracts iron

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Chris rubs an iron nail in one direction with the south pole of a magnet. Which of the following is TRUE of the magnetized nail?

• it will only be attracted to the north pole of a magnet

• it has a strong north pole and a much weaker south pole

• its domains have become rearranged so that they are lined up in one direction

• the bar magnet has caused a random arrangement of the nail's domains

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Materials in which the atom's magnetic field cancel each other out are

• aligned in domains

• not magnetic

• like iron, nickel and cobalt

• magnetic

Magnetism comes from

• static charged particles

• neutrons

• generators

• electron motion

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Magnetic field lines show that the force between a south pole and a north pole

• have no effect on the poles

• cause the poles to move away from each other

• cause the poles to move toward each other

• destroy the alignment of the domains in the magnet

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Where are the strongest magnetic effects on magnets?

• in the middle of the magnet

• at both poles of the magnet

• at only the magnet's north pole

• at only the magnet's south pole

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Which of the following would NOT cause a magnet to lose its magnetism?

• hitting it too hard

• placing it in the field of a stronger magnet

• freezing it

• heating it

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What do you end up with if you cut a magnet in half?

• one north-pole piece

• two unmagnetized poles

• two pieces, each with a north pole and a south pole

• two north pole pieces

Which metal is most commonly used in making magnets?

• copper

• lead

• aluminum

• iron

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As electrons move in a current, they make

• a broken circuit

• a magnetic field

• a gravitational force

• a bar magnet

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