Mystery Science Magnetic

What is true of all magnets?

• They are all man-made.

• They have two poles and a magnetic field.

• They are made of iron.

• They are magnetic when an electric current is ran through them.

If you have two magnets and you try to put the two north poles together, what will most likely happen?

• The poles will touch but will not stick together.

• The magnets will stick together because of magnetic attraction.

• The magnets will lose their magnetism.

• The two poles will touch each other because of magnetic repulsion.

Which of the following objects has polarity?

• a map of the country, which has a compass pointing north

• the city of Chicago which has a north and a south side

• the Earth which has a magnetic north and south pole

• an unmagnetized metal block , which has a top and bottom

A magnetic field is

• the area around a magnetic that exerts a magnetic force

• something used to demagnetize a piece of metal

• an open area where you are likely to find natural magnets

• an electric charge that can be sent through a wire to make it magnetic

True or False: Man-made magnets always retain their magnetism.

• True

• False

Which of the following works because of the Earth’s magnetism?

• a maglev train

• a computer chip

• an electric lock

• a compass

Magnetic attraction is a property that makes two magnets stick together. It occurs when

• a magnet is near a nonmagnetic object.

• two magnets south poles are near each other

• opposite poles of two magnets are near each other

• a natural magnet and a man-made magnet are near each other

Magnets are a mystery to scientists because scientists

• don't know how to tell the north pole from the south pole

• don't know why magnets have a magnetic force

• can't tell how much magnetic force a magnet has

• don't know why the earth has magnetism

Each of the following is an example of how magnets are used except

• locking padlocks with metal keys

• storing information on computer hard drives

• making trains levitate

• sticking photos on refrigerators

The ancient Greeks found some metallic rocks that attracted other metallic objects. They called them lodestones. A lodestone is an example of

• a natural magnet

• a man-made magnet

• a north pole

• a non-metallic magnet