Electric Induction

If you wrap more coils around an electromagnet, it will become...

• brighter

• stronger

• weaker

• invisible

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NGSS.HS-PS2-5

Can you produce current in a wire with a magnet that is sitting still?

• Yes; having a magnet near a wire is enough to excite the electrons

• No; the magnetic field has to be changing to excite the electrons

• No; magnets cannot create electricity

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Why is magnetic induction important?

• Electromagnets are very versatile

• Every electric motor uses induction

• Because it's an easy way to produce electricity

• All of the above

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Voltage can be induced in a wire by

• moving the wire near a magnet.

• moving a magnet near the wire.

• changing the current in a nearby wire.

• all of these

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What type of process is shown?

• Electromagnet

• Electric motor

• Electric generator

• Electromagnetic induction

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If you wrap more coils around an electromagnet, it will become...(think about the Webquest.)

• brighter

• stronger

• weaker

• invisible

Tags

NGSS.HS-PS2-5

Particles with opposite charges ____________ and particles with same (or like) charges ____________.

• attract, repel

• repel, repel

• attract, attract

• repel, attract

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What is the principle behind electromagnetic induction?

• A changing magnetic field induces an electric current

• A constant magnetic field induces an electric current

• Electric current induces a magnetic field

• Electric current and magnetic field are unrelated

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Which of the following devices operates on the principle of electromagnetic induction?

• Electric heater

• Transformer

• Battery

• Solar panel

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In an experiment, a coil is moved rapidly through a magnetic field. What is observed?

• No current is induced

• A constant current is induced

• An alternating current is induced

• The coil heats up

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