Question

Material of the core of a strong magnet is
(a) aluminium
(b) soft iron
(c) copper
(d) steel

Answer 1

Answer:

soft iron (b)

Explanation:

its correct

Answer 2

Answer:

(b) Soft Iron

Explanation:

Explanation for correct option:

Explanation for correct option:(b) Soft Iron

In order to be an electromagnet, the core must show a strong electromagnetic field when current is passed through the coil. The core must lose its captivation as well when the current inflow has stopped. Therefore, the core acts as a temporary attraction. This property is only displayed by a soft iron core.

Hence, for making a strong magnet, the material of the core should be of soft iron.

Explanation for incorrect options:

Explanation for incorrect options:(a) Aluminium

Aluminium has a low electromagnetic permeability than soft iron, so it is not used in the material of the core.

(c) Copper

Copper is very weak electromagnetic material and is unfit to observe its electromagnetic property indeed in the presence of strong electromagnetic fields (those generated using the given bar attraction).

(d) Steel

The electromagnet's core should be made up of soft iron. It's because soft iron loses all its electromagnetic property when the current in the coil is switched off. That is why we do not use steel which doesn't lose its electromagnetic property when the current is stopped.

Therefore, option (b) is correct.

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