Review of Magnetism

What kind of force can be created with an electrical current?

• chemical force

• magnetic force.

• nuclear force

• frictional force

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A student wants to use a magnet to pick up a sheet of metal, but his magnet is too far away to attract. What is a possible solution?

• use a bigger magnet to increase the size of the magnetic field

• turn the magnet around and use the opposite pole instead

• turn the magnet around and use the opposite pole instead

• turn the magnet so that the middle is pointed toward the metal

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What variables determine the gravitational force between two objects.

• mass, volume,

• mass, distance

• volume, magnetism

• mass, magnetism

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What will happen when these magnets are brought close together?

• They will attract each other.

• Both magnets will turn to the left

• They will repel each other.

• Both magnets will turn to the right

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How is Earth's magnetic field similar to that of a magnet?

• It is hundreds of miles long

• It is made in Earth's core

• It has north and south poles

• It is shaped like a horseshoe

A magnet will pick up a nail, but not a penny because the nail

• has rust on it

• has a sharp point.

• is lighter than the penny

• contains iron

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Magnetism is a type of ____________

• force

• matter

• book

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The lines on this image are called..

• magnetic field lines

• iron filings

• graphite lines

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Catherine rubs an iron nail with a ferromagnet (permanent) in one direction. Which of the following is true of the magnetized nail?

• It will only be attracted to the north pole of a bar magnet.

• It has a strong north pole and a much weaker south pole.

• Its domains have become rearranged so that they line up in the same direction.

• The bar magnet has caused a random arrangement of the nail’s domains.

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The magnetism of a piece of magnetized iron can be weakened by

• heating the iron and hammering it

• putting it near a piece of unmagnetized iron

• bending the iron

• cooling it

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