Electromagnetism

What is true about electricity and magnetic fields?

• Electricity is needed to create any magnet.
• Electricity always creates a magnetic field.
• Electricity is stronger than a magnetic field.
• Electricity prevents magnetic fields from occurring.

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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

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A compass needle responds to a magnetic field, because the compass needle is a

• A. generator.
• B. motor.   
• C. magnet.
• D. transformer.

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What happens when an electric current flows through a wire?

• The wire begins to spin.

• Nothing happens.

• A field of gravity is created around the wire.

• A magnetic field is created around the wire.

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How can a magnet be used to produce an electric current?

• Hold a magnet next to a piece of wire.

• Wrap wire around a magnet.

• Spin the magnet around inside a coil of wire.

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A _____________ transforms mechanical energy into electrical energy.

• generator

• electromagnet

• circuit

• magnetic field

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According to the Right Hand Rule, where is the magnetic field generated around a current-carrying wire?

• Perpendicular to the wire
• Parallel to the wire

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Faraday demonstrated that an electric current can be created by...

• Having a magnet near by
• Moving a magnet near a wire
• Hooking a wire up to a battery
• Running a generator

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A device that increases or decreases the voltage of alternating current

• A. magnet
• B. magnetic pole
• C. transformer
• D. magnetic force