Deck 12: Magnetism

Question 1

When freely suspended, a magnet will come to rest aligned with the magnetic field linking

A) True North and True South
B) Magnetic North and Magnetic South

Answer 1

Magnetic North and Magnetic South

Question 2

The term, 'Magnetic North', describes

A) a location near True North
B) the magnetic polarity of a location near Magnetic North

Answer 2

a location near True North

Question 3

The magnetic poles of a magnet are named after

A) the directions in which they point
B) the magnetic polarities that attract them

Answer 3

the directions in which they point

Question 4

The magnetic polarity of Magnetic North is a

A) north pole
B) south pole

Question 5

The end of a compass needle which points to Magnetic North is a

A) north magnetic pole
B) a south magnetic pole

Question 6

The fundamental law of magnetism states that 'like poles __________'

A) attract each other
B) repel each other

Question 7

The area surrounding a magnet in which its effects may be observed is termed

A) a magnetic field
B) magnetic flux

Question 8

Lines of magnetic flux

A) are invisible, but can be detected with sensitive instruments
B) do not exist, but provide a model to help us visualise a magnetic field
C) were discovered by the ancient Chinese
D) were discovered by the ancient Greeks

Question 9

The 'direction' of magnetic flux lines is defined in terms of the direction in which __________ when placed within the magnetic field

A) an isolated positive charge will move
B) an isolated negative charge will move
C) a compass needle will point

Question 10

The 'direction' of magnetic flux lines is defined as

A) north to south
B) south to north

Question 11

The poles of an unmarked magnet can be identified using a compass, which will always point to the magnet's

A) north pole
B) south pole

Question 12

Sprinkling iron filings over a sheet of card resting on a magnet will reveal

A) the polarity of the magnet's poles
B) the direction of the magnet's flux lines
C) the pattern formed by the magnet's magnetic field

Question 13

The intensity of a magnetic field is termed its __________, whose SI unit is the __________

A) flux density, tesla
B) flux density, weber
C) magnetic field strength, tesla
D) magnetic field strength, weber

Question 14

The intensity of the external magnetic field surrounding a magnet is greatest

A) at the magnet's poles
B) midway between the magnet's poles

Question 15

Soft' magnetic materials are _________ to magnetise, and __________ their magnetism once the external magnetising force is removed

A) easy, lose
B) easy, retain
C) hard, lose
D) hard, retain

Question 16

Hard' magnetic materials are __________ to magnetise, and __________ their magnetism once the external magnetising force is removed

A) easy, lose
B) easy, retain
C) hard, lose
D) hard, retain

Question 17

Soft' magnetic materials are used to make __________ magnets

A) permanent
B) temporary

Question 18

Hard' magnetic materials are used to make __________ magnets

A) permanent
B) temporary

Question 19

Steel is generally considered to be a '__________' magnetic material, and can be used to make __________ magnets

A) hard, temporary
B) hard, permanent
C) soft, temporary
D) soft, permanent

Question 20

Soft iron is generally considered to be a '__________' magnetic material, and can be used to make __________ magnets

A) hard, temporary
B) hard, permanent
C) soft, temporary
D) soft, permanent

Question 21

A 'domain' is the name given to

A) an atom or molecule that behaves like a tiny magnet
B) an electron that behaves like a tiny magnet
C) any tiny magnet
D) the area near the pole of a magnet

Question 22

When a magnet's 'domains' are all aligned, the magnet is said to be

A) hard'
B) permanent'
C) saturated'

Question 23

When a magnet is broken in two, the result is

A) two, separate, magnets
B) two magnets, each having just one pole
C) two magnets with like poles
D) the loss of the magnetic field