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 is switched off, so it needs low retentivity.
- Low coercivity gives a narrow hysteresis loop, so it is easy to demagnetise and has little energy loss.
- So the answer is (b) low retentivity and low coercivity.