Question

Core of an electromagnet must be of soft iron but not steel. Justify it.

Answer 1

Answer:

because soft iron core's hysteresis loss is much less as compared to the steel,so the soft iron is used

Answer 2

Core of an electromagnet must be of soft iron but not steel.

Explanation:

An electromagnet is a magnet that is created by electricity. Unlike a permanent magnet, the strength of an electromagnet can easily be changed by changing the amount of electric current that flows through it.  

Steel is stronger and it is not suitable for electromagnet. But soft iron forms a temporary magnet when electricity flows through it. The electromagnet can be switched on and off by turning the electricity on and off.