Chapter 20 Lesson 2 Making Magnets with an Electric Current

Electronic devices create magnetic fields because they

• are magnets

• are compasses

• have moving particles with electric charge

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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 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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What THREE ways are electromagnets different from permanent magnets?

• they can be turned off and on

• they can increase in strength by increasing the current in the wire

• they are smaller in size

• they can change which is the north and south pole

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Electromagnets are useful in industry such as a junk yard because they

• have strong north and south poles

• are easy to lift

• can be turned off and on

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Permanent Magnets and Electromagnets are similar in which TWO ways?

• it can be turned off and on

• they both have a north and south pole

• they are surrounded by a magnetic field

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Increasing the number of coils in an electromagnet will _________ the strength of the magnet.

• decrease

• increase

• not affect

An electric current produces

• a magnetic field.

• an electromagnet.

• a solenoid.

• an insulator.

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What device is made of coils of wire with an electrical current passing through it in order to generate a magnetic field?  

• Electromagnet 
• Generator
• Electron Magnet 
• Motor

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How are electromagnets different from magnets?

• magnets can be turned on/off
• you can turn an electromagnet on/off
• magnets are more powerful
• magnets have a North and South pole

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