Magnetism

Question 1

What is the name of the naturally magnetic iron ore?

Answer 1

Magnetite

Question 2

There are lines of force that pass through the space surrounding a magnet, what are these lines called?

Answer 2

Lines of magnetic flux

Question 3

What direction do the lines of magnetic flux travel?

Answer 3

They leave the magnet at the North Pole and re-enter at the South Pole

Question 4

Name 2 types of commonly used permanent magnets.

Answer 4

1. Bar
2. Horseshoe

Question 5

What happens if 2 like poles are brought close together?

Answer 5

There will be a force of repulsion, pushing them apart

Question 6

What happens if 2 un-like poles are brought close together?

Answer 6

There will be a force of attraction, pulling them together

Question 7

List 3 materials that, mixed with steel, will produce stronger magnets

Answer 7

1. Aluminium
2. Cobalt
3. Nickel

Question 8

What is produced around a conductor when a current is passed through it?

Answer 8

Lines of magnetic flux

Question 9

Permanent magnet and electro-magnet are two ways of producing a magnet. Name one more.

Answer 9

Stroking a permanent magnet along a magnetic material

Question 10

What are the 3 requirements needed for magnetism to produce a voltage by induction?

Answer 10

1. A magnetic field
2. An electrical conductor
3. Relative movement

Question 11

Describe permanent magnets

Answer 11

Materials which on becoming magnetised, remain magnetised after the magnetic influence is removed.

Question 12

Describe temporary magnets

Answer 12

Materials that are easily magnetised but become demagnetized when the magnetic influence is removed.

Question 13

describe a method to produce electricity using a magnet.

Answer 13

Move a magnet past a stationary wire