Magnetism review

What does a magnetic field look like?

• a series of white, dotted lines

• it's invisible

• a clear piece of plastic or glass

• a shimmering area in the air

Which of the following metals can be magnetized?

• lead

• iron

• copper

• silver

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How can you create a magnetic field?

• by stringing many magnets together

• by plugging a refrigerator magnet into an electric socket

• by rubbing a piece of glass against a piece of wool

• by running a current through the wire

Which of the following statements is true?

• a compass is affected by the earth's magnetic field

• an object's magnetic field gets weaker as you move closer to it

• once a piece of metal becomes magnetized, it stays magnetized

• the earth's magnetic north pole is located at the geographical north pole

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Where might you find an electromagnet?

• in a fluorescent light bulb

• hanging on your refrigerator door

• in an electric motor

• in pieces of rock called magnetite

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If you have an electromagnet, how can you make its magnetic field stronger?

• increase the size of the magnetic domains

• increase the strength of the electrical current

• increase the length of the wire

• increase the distance between the north and south poles

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Rub a magnet on an iron nail a few times and it will now ______ paperclips.

• attract

• repel

• look like

• smell like

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A coil of wire that acts as a magnet when electricity passes through it is a

• permanent magnet

• south pole

• north pole

• electromagnet

If a north pole and south pole face each other they will

• become the same

• switch poles

• attract

• repel

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if north poles of two magnets face each other, they will

• attract

• repel

• switch poles

• become two south poles

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