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
Correct Answer: B
Solution :Iron is a ferromagnetic substance. There are no magnetic lines of force inside a ferromagnetic substance. So, equipment maybe protected by placing it inside the can made of a ferromagnetic substance. Hence, it is placed inside an iron can.
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