Question

The soft-iron core of an electromagnet loses its magnetism once the current passing through the electromagnetic coil stops because

• A. Domains lose their alignment when the current is stopped.
• B. Iron cannot hold alignment for longer time even when the current is passing through the coil
• C. Magnetic properties of iron are weak
• D. Domains inside the iron get aligned in north to south direction.

Answer 1

The correct option is A Domains lose their alignment when the current is stopped.

The soft iron core of an electromagnet loses its magnetism once the current passing through the electromagnetic coil stops because domains lose their alignment when the current is stopped.

Magnetism is only due to alignment of domains of a magnetic substance. And in electromagnet ; magnetic comes; i.e. alignment of domains takes place when current (electric) passes through the electromagnet. And when current stop domains lose their alignment.

OPTION : A.