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For protecting a sensitive equipment from the external electric arc, it should be

1. wrapped with insulation around it when a current is passing through it
2. placed inside an iron can
3. surrounded with fine copper sheet
4. placed inside an aluminium can

Correct answer: placed inside an iron can

Solution

Placing the equipment inside an iron can provides effective shielding due to the high permeability of iron, which helps in blocking external electric fields and arcs.

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