To shield an instrument from external magnetic field, it is placed inside a cabin made of (1) Wood (2) Plastic (3) Diamagnetic substances (4) Iron Shouldn't the answer be Diamagnetic sunstance since magnetic field does not pass through it? Ans given is Iron..Why iron?

Dear student,
Shielding is always done through ferromagnetic substances.
The cabin is made of iron because maximum lines of forces pass through it.
Regards

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