AnswersTX-Physics CRLab: Circuit Design

Applications of Electromagnetic Induction Answers

9 verified answers3 views
1
Free Preview

Which is an important step in how an electric motor uses magnetic force to produce motion?

A
As the north pole of the electromagnet nears the north pole of the permanent magnet, the current reverses and the poles of the magnets then attract.
B
As the north pole of the electromagnet nears the south pole of the permanent magnet, the current reverses and the poles of the magnets then repel.
C
As the north pole of the electromagnet nears the north pole of the permanent magnet, the current reverses and the poles of the magnets then repel.
D
As the north pole of the electromagnet nears the south pole of the permanent magnet, the current reverses and the poles of the magnets then attract.
2
Free Preview

How does an electric motor use magnetic force to produce motion?

A
The north pole of a permanent magnet placed in the center of an electromagnet attracts the north pole of the electromagnet.
B
The north pole of an electromagnet placed in the center of a permanent magnet attracts the north pole of the permanent magnet.
C
The north pole of a permanent magnet placed in the center of an electromagnet repels the north pole of the electromagnet.
D
The north pole of an electromagnet placed in the center of a permanent magnet repels the north pole of the permanent magnet.
3

The diagram shows a simple electric generator that Keisha is studying.

Question illustration
A
It will move to a large positive value and stay there.
B
It will move back and forth between 0 and a large positive value.
C
It will move back and forth between a large positive and a large negative value.
D
It will move to a large negative value and stay there.
4

brushtransformercommutatorarmature

A
brush
B
transformer
C
commutator
D
armature
5

Which best describes what happens in an electric generator?

A
Motion causes constantly changing magnetic fields to induce electrical energy.
B
Motion causes constantly changing magnetic fields to induce kinetic energy.
C
Constantly changing magnetic fields lead to motion, which induces electrical energy.
D
Constantly changing magnetic fields lead to motion, which induces kinetic energy.
6

The voltage across the primary winding is 6000 V. If the primary winding has 50 coils and the secondary winding has 20 coils, what is the secondary voltage?

A
120 V
B
2400 V
C
15,000 V
D
120,000 V
7

What parts are found in an electric generator? Select 4 options.an armaturea batterya permanent magnetan electromagnetbrushesslip rings

A
an armature
B
a battery
C
a permanent magnet
D
an electromagnet
E
brushes
F
slip rings
8

In a step-down transformer, which describes the primary winding compared with the secondary winding?

A
higher voltage and fewer coils of wire
B
higher voltage and more coils of wire
C
lower voltage and fewer coils of wire
D
lower voltage and more coils of wire
10

How does an electric generator work?

A
The axle rotates the armature in the magnetic field of a permanent magnet, which induces an electric current.
B
The armature rotates the axle in the magnetic field of a permanent magnet, which induces an electric current.
C
The axle rotates the armature in the magnetic field of an electromagnet, which induces an electric current.
D
The armature rotates the axle in the magnetic field of an electromagnet, which induces an electric current.

Did you find these answers helpful?

More from this Course

Quiz
10 verified answers

Magnetic Field and Force

Quiz
10 verified answers

Electromagnetic Induction

Quiz
8 verified answers

Electromagnetic Induction