PS2.2 Relationship between Magnetism & Electricity

How is an electromagnet different from a permanent magnet?

• An electromagnet’s magnetism can be turned off.
• An electromagnet is smaller and less powerful.
• An electromagnet can be built without using metal.
• An electromagnet does not attract objects containing iron.

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A device that converts mechanical energy into electrical energy

• electric generator

• electric motor

• electromagnetic induction

• Electromagnet

A coil of wire with an electric current in it is called a(n)

• transformer.

• electric generator.

• electric motor.

• solenoid.

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What is created when a magnet moves through a coil of wire?

• an electromagnet

• a ferromagnet

• a solenoid

• an electric current

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A coil of wire that has a soft iron core and that acts as a magnet when an electric current is in the coil is called a(n)

• solenoid

• permanent magnet.

• electromagnet

• ferromagnet.

The strength of an electromagnet can be affected by (choose all correct answers)

• changing the current in the wire

• changing the thickness of the wire

• changing the number of coils

• none of these

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This is a picture of a simple electromagnet. How can the electromagnet be made stronger?

• Add more coils of wire to the nail.
• Use a smaller battery.
• Reverse the poles of the magnet.
• Remove all the coils and the nail.

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What kind of magnet can be turned on and off?

• refridgerator magnet
• electromagnet
• magnetite
• iron

In order for an electromagnet to be formed, an __________ current must pass through a coil of __________ wrapped around an ________ core.

• wire, iron, electric
• electric, wire, iron
• iron, electric, wire
• excited, hair, apple

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What is most likely to happen when the switch is closed?

• A magnetic field should be produced

• The nail will rust

• an electric current would not pass through the wire

• The wire will catch on fire