For protecting a sensitive equipment from the external magnetic field, it should be (a) placed inside an aluminium can (b) placed inside an iron can (c) wrapped with insulation around it when passing current through it (d) surrounded with fine copper sheet

Answer: (b). Iron has very high permeability, so field lines are drawn into the iron walls and pass around the inside. The inside of an iron can is nearly field free. Aluminium and copper have μr ≈ 1 and give no shielding. So the answer is (b) placed inside an iron can.

For protecting a sensitive equipment from the external magnetic… | NEET 1998 (AIPMT)

Q20NEET 1998 · AIPMTEasy

Hysteresis, Soft Iron vs Steel & Shielding

For protecting a sensitive equipment from the external magnetic field, it should be

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Answer: (b)

Iron has very high permeability, so field lines are drawn into the iron walls and pass around the inside.
The inside of an iron can is nearly field free. Aluminium and copper have $\mu_r \approx 1$ and give no shielding.
So the answer is (b) placed inside an iron can.

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