The materials suitable for making electromagnets should have (a) high retentivity and high coercivity (b) low retentivity and low coercivity (c) high retentivity and low coercivity (d) low retentivity and high coercivity

Answer: (b). An electromagnet must lose its magnetism when the current stops, which needs low retentivity. Low coercivity means it is easily demagnetised, and a narrow loop means little hysteresis loss. So the answer is (b) low retentivity and low coercivity.

The materials suitable for making electromagnets should have | MHT CET 2023 (9 May, Shift 1)

Q8MHT CET 2023 · 9 MAY · SHIFT 1Easy

Hysteresis, Soft Iron vs Steel & Shielding

The materials suitable for making electromagnets should have

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Answer: (b)

An electromagnet must lose its magnetism when the current stops, which needs low retentivity.
Low coercivity means it is easily demagnetised, and a narrow loop means little hysteresis loss.
So the answer is (b) low retentivity and low coercivity.

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Hysteresis, Soft Iron vs Steel & Shielding question from MHT CET 2023 (9 May, Shift 1)

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