Chapter 12, ELECTROMAGNETISM Video Solutions, Electricity 1: Devices, Circuits and Materials

Problem 1

Select the best answer in problems 1 through 7 to make each statement true. Place your answers in the spaces provided.
A straight current-carrying conductor has _____
a. two magnetic poles.
b. one $\mathrm{N}$ pole only.
c. no magnetic poles.
d. one magnetic pole.
e. a field similar to a bar magnet.

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Problem 2

Select the best answer in problems 1 through 7 to make each statement true. Place your answers in the spaces provided.
The direction of conductor flux is dependent on_____
a. current magnitude.
b. current direction.
c. the compass needle.
d. the magnitude of voltage applied.
e. the core material.

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Problem 3

Select the best answer in problems 1 through 7 to make each statement true. Place your answers in the spaces provided.
The magnetic polarity of a coil is determined by
a. the magnitude of voltage applied.
b. the current magnitude.
c. the magnetic strength.
d. the number of turns.
e. the direction of current.

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Problem 4

Select the best answer in problems 1 through 7 to make each statement true. Place your answers in the spaces provided.
The magnetic strength of a coil depends on_____
a. current direction.
b. the left-hand rule.
c. flux direction.
d. current magnitude.
e. the point where the field emerges.

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05:11

Problem 5

Select the best answer in problems 1 through 7 to make each statement true. Place your answers in the spaces provided.
A 20-turn coil, with an air core, carries a current of 2 amperes._____
The magnetic strength of the coil can be increased by
a. making the turns larger.
b. inserting an iron core.
c. decreasing the current.
d. slightly decreasing the voltage drop across the coil.
e. reversing the current direction.

Vishal Gupta

Numerade Educator

03:06

Problem 6

Select the best answer in problems 1 through 7 to make each statement true. Place your answers in the spaces provided.
When iron filings are attracted to a current-carrying conductor, this indicates_____
a. a magnetic field direction.
b. a $\mathrm{N}$ pole.
c. the presence of a magnetic field.
d. the strength of a magnetic field.
e. the magnitude of current.

Amit Srivastava

Numerade Educator

Problem 7

Select the best answer in problems 1 through 7 to make each statement true. Place your answers in the spaces provided.
The properties of a magnet are present in_____
a. a loop of wire.
b. a straight wire.
c. many turns of wire.
d. a straight wire carrying current.
e. a current-carrying loop of wire.

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01:12

Problem 8

What is the purpose of the left-hand rule on a straight piece of wire?
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Amna Khalid

Numerade Educator

02:55

Problem 9

What does the left-hand rule indicate in terms of a coil of wire?
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Amna Khalid

Numerade Educator

02:19

Problem 10

If an iron bar is removed from the center of a coil, and the current is held constant, what will happen to the strength of the magnetic field?
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Prabhu Ramji

Numerade Educator

01:02

Problem 11

Explain the “dot-cross” method of indicating current direction.
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Narayan Hari

Numerade Educator

00:47

Problem 12

The strength of a magnetic field depends upon the amount of current in the wire, the number of turns of the coil, and ___________________________________________________________________

Suzanne W.

Numerade Educator