Question

Give two essential characteristics of material used for preparing an electromagnet

Answer 1

Answer:

(a)high retentivity so that the magnet is strong and

(b) high coercivity so that the magnetisation is not erased by stray magnetic fields, temperature fluctuations or minor mechanical damage.

Answer 2

Answer:

1.Quantity of current passing through wire.

2.Number of turns.

3.Inserting a soft iron bar/core.