A) placed inside an iron can
B) placed inside an aluminium can
C) surrounded with fine copper sheet
D) wrapped with insulation around it when passing current through it
Correct Answer: A
Solution :
For protecting sensitive equipment from external magnetic field, it must be placed inside a can made from ferromagnetic substance because there are no magnetic lines of force inside it. Iron is a ferromagnetic substance, hence it is used to keep the sensitive equipment.
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