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Magnetism And Meters > L1 - Magnetism Quiz > Flashcards

L1 - Magnetism Quiz Flashcards

1
Q

State the difference between a temporary magnet and a permanent magnet

A

A temporary magnet is easily magnetized, but loses its magnetism when the magnetizing force is removed.

A permanent magnet is harder to magnetize, but retains most of its magnetism when the magnetizing force is removed.

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2
Q

Name the material that is generally used for temporary magnets

A

Soft iron

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3
Q

Name the material that is generally used for permanent magnets

A

Hard steel

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4
Q

List three common magnetic materials

A

Nickel, manganese and colbalt

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5
Q

Generally, it is said that when all magnetic domains of a substance are aligned, its magnetic strength is at its X.

A

Maximum

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6
Q

Magnetic lines of force never X each other

A

Cross

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7
Q

Magnetic lines of force always for X or circuits.

A

Complete loops

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8
Q

Magnetic lines of force tend to be as X as X in length.

A

Short, possible

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9
Q

If a magnet has a North pole, it must have a

A

South pole

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10
Q

Magnetic lines of force tends to X each other.

A

Repel

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11
Q

Magnetic lines of force will always set up in the path of least X

A

Reluctance

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12
Q

Magnetic lines of force have a direction that indicate movement from X to X through a material such as air.

A

North, South

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13
Q

Magnetic lines of force have a direction that indicate movement from X to X through a magnet.

A

South, North

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14
Q

Magnetic lines of force tend to concentrate in a X material and spread out in a X -X material.

A

Ferromagnetic
Non-ferromagnetic

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15
Q

Magnetic materials are known as X, which means they tend to act like X.

A

Ferromagnetic, magnets

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16
Q

Magnetic fields of like polarity tend to X each others

A

Repel

17
Q

Magnetic fields of unlike polarity tend to X each other.

A

Attract

18
Q

Magnetic lines of force can create permanent or temporary magnets by

A

Induction

19
Q

Magnetic lines of force are also know as magnetic X or a magnetic X.

A

Flux, field

20
Q

Magnetic lines of force can pass through any X

A

Material

21
Q

The North pole of the Earth is actually a magnetic X

A

South pole

22
Q

A X is the only effective way to keep a designated area relatively free of magnetic lines of force.

A

Magnetic screen

23
Q

State the three ways can be used to effectively demagnetize a material

A

AC electric current, heating to Curie Temperature, vibrating of tapping.

24
Q

List three materials that are classified as ferromagnetic and explain what this term means.

A

Nickel, manganese, cobalt

Their magnetic domains can be easily aligned

25
Q

State the name of a naturally occurring permanent magnet.

A

Lodestone

26
Q

Which material will have more flux lines of flux when subjected to the same magnetizing force.

A - Cast iron
B- Cast steel
C - Steel Sheet
D- Copper

A

C - Sheet steel

27
Q

Which material will have more residual magnetism after being subjected to the same magnetizing force?

A - Hard steel
B- Soft iron
C - Aluminium
D - Copper

A

A- Hard steel

28
Q

Which material offers the least opposition (reluctance) to magnetic lines of force?

A - Cast iron
B- Cast steel
C - Sheet steel
D - Air

A

C - Sheet steel

29
Q

Which material offers the greatest opposition ( reluctance) to magnetic lines of force?

A - Cast iron
B- Cast steel
C - Sheet steel
D- Air

A

D - Air

30
Q

Which of the following materials is best for a magnetic screen?

A - Hard steel
B- Soft iron
C - Copper
D - Aluminium

A

B - Soft iron

31
Q

Which of the following best describes ‘magnetic flux’?

A - A type of soldering compound
B - Two electrons spinning in opposite directions
C - Invisible lines of force
D - An attraction between Aluminium and iron

A

C - Invisible lines of force

32
Q

What would the resistance of a material to conducting lines of flux be called?

A - Permeability
B- Retentivity
C - Residual magnetism
D - Reluctance

A

D - Reluctance

Magnetism And Meters (8 decks)

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