Chapter 11, MAGNETS AND MAGNETIC FIELDS Video Solutions, Electricity 1: Devices, Circuits and Materials

Problem 1

Select the best answer to make each statement true, and place the letter of the answer in the space provided.
When a magnetizing force is removed from a material, the kind of magnetism that remains is called_____
a. strong.
d. electromagnetism.
b. weak.
e. flux.
c. residual.

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Problem 2

Select the best answer to make each statement true, and place the letter of the answer in the space provided.
The kind of magnet that is made by wrapping a coil of wire around a bar of steel is called_____
a. a permanent magnet.
c. a transformer.
b. an electromagnet.
d. a pole magnet.

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Problem 3

Select the best answer to make each statement true, and place the letter of the answer in the space provided.
Magnetic lines of force are known as_____
a. induction.
c. attracting influences.
b. poles.
d. flux.

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00:57

Problem 4

Select the best answer to make each statement true, and place the letter of the answer in the space provided.
Flux density is an indication of_____
a. repulsion.
d. field strength.
b. an electromagnet.
e. a temporary magnet.
c. a permanent magnet.

Nishant Kumar

Numerade Educator

Problem 5

Select the best answer to make each statement true, and place the letter of the answer in the space provided.
The magnetism present in a piece of soft steel held near a magnet is called_____
a. induced magnetism.
d. electromagnetism.
b. residual magnetism.
e. permanent magnetism.
c. insulated magnetism.

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Problem 6

Select the best answer to make each statement true, and place the letter of the answer in the space provided.
The number of lines of force per CSA is a measure of_____
a. magnetic flux density.
b. magnetic intensity.
c. the laws of magnets.
d. flux.
e. flux patterns.

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Problem 7

Select the best answer to make each statement true, and place the letter of the answer in the space provided.
Magnetic properties are possessed by_____
a. iron and steel only.
b. nickel, cobalt, and gadolinium only.
c. the materials stated in (a) and (b) only.
d. hard and soft steel only.
e. all materials.

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01:02

Problem 8

Select the best answer to make each statement true, and place the letter of the answer in the space provided.
Magnetic lines of force_____
a. can be insulated with air.
b. pass through the magnet.
c. form loops that mix and cross.
d. exist only in temporary magnets.
e. emerge from the $\mathrm{S}$ pole.

Narayan Hari

Numerade Educator

Problem 9

What type of insulation can be used to block magnetic flux? _____

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Problem 10

What is meant by the term "flux density"?_____

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00:54

Problem 11

Soft steel is not normally used for permanent magnets. Why?
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Christopher Dzorkpata

Numerade Educator

01:00

Problem 12

What will be the result if two magnets are brought next to each other?
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Averell Hause

Carnegie Mellon University

02:26

Problem 13

Motors and generators operate on the principle of ___________________________________________________________________

Amna Khalid

Numerade Educator