Electricity and Magnetism Review

What happens if you break a magnet in half?

• One half will have a north pole only and one half will have a south pole only.

• Neither half will have a pole.

• Each half will be a new magnet, with both a north and south pole.

• Neither half will be able to attract or repel.

An example of a common magnetic material is ___.

• plastic

• hydrogen

• nickel

• copper

Magnetic field lines around a bar magnet are ___.

• perpendicular to the magnet.

• spread out from the poles and curve around the magnet.

• cross back and forth over one another.

• are perfectly straight.

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A magnetic field is produced by moving electrons, which carry an electric ___.

• proton.

• charge.

• circuit.

• resistance.

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Every magnet, regardless of its shape, has two ___.

• magnetic poles.

• magnetic charges.

• magnetic fields.

• magnetic domains.

You can increase the strength of an electromagnet's field by

• decreasing the current in the wire.

• decreasing the number of loops in the wire.

• using a stronger magnetic material for the core.

• increasing the thickness of the insulation on the wire.

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Since Earth produces a strong magnetic field,

• Earth can make magnets.

• Earth can attract other planets.

• meteorites tend to move in Earth's direction.

• the ground will repel a magnet placed upside-down.

An electromagnet would most likely be used as a ___.

• pocket compass

• ski lift

• refrigerator decoration.

• device on the end of a crane to lift junked cars.

As in the case of unlike magnetic poles, unlike electric charges ___.

• repel each other.

• attract each other.

• exist in pairs.

• do not interact.

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Suppose you acquire a positive charge from walking across a carpet. You then touch a doorknob and receive an shock. This leaves you ___.

• positively charged.

• negatively charged.

• supercharged.

• electrically neutral.