Question

What is an electromagnet ? State two ways ways by which the strength of an electromagnet can be increased.

Answer 1

When electric current is passed in a solenoid material like soft iron, the core becomes an electromagnet.

Strength of magnetic field in a solenoid is given by $B={\mu }_{0}nI$

The strength of an electromagnet can be increased by

(i) increasing the current,

(ii) increasing the number of turns in the coil