MHT CET 2025 Physics question

Not in JEE Advanced syllabus

To protect the instrument from magnetic field, it is completely surrounded by

(A)soft ferromagnetic substance.Correct
(B)diamagnetic substance only.
(C)paramagnetic substance only.
(D)both diamagnetic and paramagnetic substances.

Answer: (A)

Solution

Magnetic shielding works because a material of very high permeability offers a low-reluctance path to magnetic field lines, so the lines are diverted through the walls of the shell and the space inside stays almost field-free. Soft iron (a soft ferromagnetic substance) has a very high permeability and negligible

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Question ID VK-102654