# Chapter 25: Electromagnetic Induction

10 Questions | Total Attempts: 1479  Settings  .

• 1.
When there is a change in the magnetic field in a closed loop of wire
• A.

a voltage is induced in the wire.

• B.

A current is created in the loop of wire.

• C.

Electromagnetic induction occurs.

• D.

All of these

• E.

None of these

• 2.
Thrust a magnet into a coil of wire and the coil
• A.

Becomes an electromagnet.

• B.

Has a current in it.

• C.

Both of these

• D.

Neither of these

• 3.
When a bar magnet is thrust into a coil of copper wire, the coil tends to
• A.

Attract the magnet as it enters.

• B.

Repel the magnet as it enters.

• C.

Both of these

• D.

Neither of these

• 4.
Electromagnetic induction occurs in a coil when there is a change in
• A.

Electric field intensity in the coil.

• B.

Magnetic field intensity in the coil.

• C.

Voltage in the coil.

• D.

The coil's polarity.

• E.

Electromagnetic polarity.

• 5.
Voltage can be induced in a wire by
• A.

Moving the wire near a magnet.

• B.

Moving a magnet near the wire.

• C.

Changing the current in a nearby wire.

• D.

Choices A, B, and C are all true.

• E.

None of the above choices are true.

• 6.
A wire moving at right angles to a magnetic field has NO induced voltage
• A.

If it is made of copper.

• B.

If it is moving slowly.

• C.

If it is moving very fast.

• D.

If the wire is covered with insulation.

• E.

None of the above choices are correct.

• 7.
The magnetic field strength inside a current-carrying coil will be greater if the coil encloses a
• A.

Vacuum.

• B.

Wooden rod.

• C.

Glass rod.

• D.

Rod of iron.

• E.

None of these

• 8.
If a magnet is pushed into a coil, voltage is induced across the coil. If the same magnet is pushed into a coil with twice the number of loops
• A.

One half as much voltage is induced.

• B.

The same voltage is induced.

• C.

Twice as much voltage is induced.

• D.

Four times as much voltage is induced.

• E.

None of these

• 9.
An electric motor is very similar to
• A.

An electric generator.

• B.

An automobile battery.

• C.

• D.

None of the above choices are correct.

• 10.
A device that transforms electrical energy to mechanical energy is a
• A.

Generator.

• B.

Motor.

• C.

Transformer.

• D.

Magnet.

• E.

None of these

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