Chap 15

Question 1

Law of Magnetism

Answer 1

Unlike poles attract, like poles repel

Question 2

when magnetic materials come into contact with magnets, what happens.

Answer 2

The material becomes an induced magnet and becomes attracted to the magnet

Question 3

North and South, which attracts and which gets attracted

Answer 3

South attracts North

Question 4

Methods of magnetizing

Answer 4

Stroking and Electrical

Question 5

Electrical Method of magnetizing

Answer 5

Using Right hand grip rule
if current going up when facing you, thumb faces right thus North is right
if current going down, thumb faces left, thus North is left

Question 6

Methods of demagnetizing

Answer 6

Heating
Hammering
Electrical Method using alternating current

Question 7

Iron vs Steel (and such)

Answer 7

Iron is a soft material, which means it’s easily magnetised and demagnetised. They do not retain their magnetism and are good for temporary magnets.
Steel is a hard material, which means it’s harder to magnetise and demagnetise. They retain their magnetism easily and thus are a good permanent magent

Question 8

what does a dot and cross mean in a circuit

Answer 8

Dot : current flowing out of the paper
Cross : current flowing into the paper

Question 9

Fleming left hand rule

Answer 9

Thumb is Force
Index is Magnetism
Middle Finger is Charge