Question 5
(a) Name one material used in making a permanent magnet.
(b) Give two reasons why iron is used in electromagnets.
Observation
Majority of the candidates did not attempt this item. Few who attempted performed below average.
The expected answer is as stated below:
(a) Name of material used in making permanent magnet
- Steel
- Nickel
- Cobalt
- Ticonal
- Alcomax
- Gadolinium
(b) Reasons why iron is used in electromagnets
It is easily magnetized and demagnetined
It produces a strong magnetic field
It has high magnetic peamability.