Electromagnets

A magnetic field is a force field created by

• gravity

• force

• magnets

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Arrows are close together on a force field when the force is

• stronger

• weaker

• opposite

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A compass needle shows us the magnetic field of

• the sun

• Earth

• the moon

• a magnet that is near by

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Earth has a magnetic field that is similar to a bar magnet's magnetic field.

• true

• false

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Earth's magnetic South Pole is near Earth's geographic North Pole

• true

• false

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Electronic devices create magnetic fields because they

• are magnets

• are compasses

• have moving particles with electric charge

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A compass needle points north because of Earth's magnetic field unless

• it is close to a wire with a current

• it is close to any wire

• it is close to a battery

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How can you test to see if there is a current running through a wire?

• listen carefully to see if you hear a buzzing sound

• place several compasses around the wire

• place several batteries around the wire

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The compass needles are turned by magnetic forces caused by electric current. The magnetic forces caused by an electric current are one kind of

• gravitational force

• gravitational field

• electromagnetic force

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The electromagnetic forces from a current carrying wire are strong enough to move the compass needle. The forces can be made stronger by

• making the wire shorter

• making the wire longer

• making the wire into loops

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