Deck 4: Magnetism

Question 1

What type of magnet depends on flowing current to produce a magnetic field?

A) electromagnet
B) permanent magnet
C) temporary magnet
D) domain magnet

Answer 1

A

Question 2

A basic law of magnetism states that unlike poles _____ and like poles _____.

A) attract; repel
B) repel; attract

Answer 2

A

Question 3

Lodestone is a name for a naturally occurring magnetic material that is also called _____.

A) lead
B) magnetism
C) copper
D) magnetite

Answer 3

D

Question 4

Earth contains magnetic poles.

Question 5

The measure of a material's ability to be magnetized is called _____.

A) permeability
B) reluctance
C) saturation
D) residual magnetism

Question 6

If a permanent magnet is cut into pieces, each piece _____ a separate magnet.

A) is not
B) is

Question 7

In the English system of measure, magnetic strength is measured in terms of _____.

A) residual magnetism
B) reluctance
C) permeability
D) flux density

Question 8

The angular difference between true north and magnetic north is known as the angle of _____.

A) polarity
B) retribution
C) declination
D) magnetism

Question 9

Magnetic lines of force are referred to as _____.

A) flux
B) spin
C) reluctance
D) bands

Question 10

Magnetism can be explained in terms of _____ spin patterns.

A) electron
B) neutron
C) proton
D) quark

Question 11

The strength of an electromagnet is primarily proportional to its _____.

A) length
B) ampere-turns
C) diameter
D) core resistance

Question 12

Man-made permanent magnets retain their magnetism _____ than natural magnets.

A) less
B) longer

Question 13

The north pole of a compass needle points in the direction of the south geographic pole.

Question 14

The north magnetic pole of a compass needle is attracted to the _____ magnetic pole of the earth.

A) north
B) south
C) east
D) west

Question 15

What type of magnets do not require any power or force to maintain their field?

A) electromagnets
B) permanent magnets
C) temporary magnets
D) domain magnets

Question 16

When a magnetic material's molecules are all lined up, and increases in current flow no longer cause increases in magnetic field strength, the material has reached _____.

A) permeability
B) reluctance
C) saturation
D) residual magnetism

Question 17

The regions formed in the molecular structure of magnetic metals are sometimes called magnetic _____.

A) quarks
B) spins
C) domains
D) atoms

Question 18

The three substances that form natural magnets are _____.

A) iron, boron, and cobalt
B) copper, iron, and cobalt
C) copper, nickel, and boron
D) iron, nickel, and cobalt

Question 19

The amount of magnetism left in a material after the magnetizing force has stopped is called _____.

A) permeability
B) reluctance
C) saturation
D) residual magnetism

Question 20

The measure of a material's resistance to magnetism is known as _____.

A) permeability
B) reluctance
C) saturation
D) residual magnetism

Question 21

In the English system, the total force producing a magnetic field is the _____.

A) magnetomotive force
B) reluctance
C) permeability
D) flux density

Question 22

Of the three basic classifications of magnetic materials,  _______________ materials are either metal or nonmetal materials that cannot be magnetized.

Question 23

Of the three basic classifications of magnetic materials, _______________ materials are metals that are most easily magnetized.

Question 24

To locate the north pole of an electromagnet, use the _____-hand rule.

A) left
B) right

Question 25

If an object is placed in the field of an strong electromagnet connected to an AC line, the object will be _____.

A) demagnetized
B) magnetized