JEE Main · 2022 · 24 Jun 2022 · Shift 2 · Magnetic Properties of Matter

The soft-iron is a suitable material for making an electromagnet. This is because soft-iron has :

(A)low coercively and high retentively
(B)low coercively and low permeability
(C)high permeability and low retentively✓ Correct
(D)high permeability and high retentively

Answer: (C)

Solution

Soft iron is ideal for electromagnets because it has high permeability (easily magnetized) and low retentivity (does not retain magnetization after the field is removed). Low coercivity means it requires minimal reverse field to demagnetize. These properties allow the electromagnet to be turned on and off easily.

JEE Main · 2022 · 24 Jun 2022 · Shift 2 · Single correct option

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