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

Placed inside an aluminium cane

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Placed inside an iron cane

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Wrapped with insulation around it when passing current through it

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Surrounded with fine copper sheet

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Solution

The correct option is B Placed inside an iron cane
Concept of magnetic screening.

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A sensitive magnetic instrument can be shielded very effectively from outside magnetic fields by placing it inside a box of:

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