AP Physics Electromagnetic Induction

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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What can electromagnets do that regular magnets can't?

• Switch their magnetic fields

• Explode

• Be turned off

• They are both the same in every way

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Which of the following statement is correct?

• The value of the magnetic flux is not relative to the total number of lines passing through the loop.

• When the area is perpendicular to the lines, no lines pass through the area.

• When the area is parallel to the lines, the maximum number of lines pass through the area.

• When area is perpendicular to the lines, the maximum number of lines pass through the area.

Describe the direction of current in an AC generator?

• The electric current reverses direction regularly.

• The electric current flows is permanent. 

• The flow of electric current is irreversible. 

• The electric current flows in one direction. 

The process of inducing an electric current with a magnetic field known as electromagnetic induction.

• True

• False

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Which law states that the induced e.m.f. and the current constantly oppose the source that produces them?

• Lenz's

• Charle's

• Faraday's

• Coulomb's

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A current produced by an induced e.m.f. is called?

• Induced current

• Magnetic current

• Current flow

• Current

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What is/are the factor/s involved in Faraday's Law?

• Time

• Flux

• Number loops

• All of the choices

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When the voltage in the secondary coil decreases, it is called step-down transformer.

• True

• False

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