MHT CET 2023 Physics question

Not in JEE Advanced syllabus

Magnetic shielding is done by surrounding the instrument to be protected from magnetic field by

(A)soft ferromagnetic substance soft ironCorrect
(B)diamagnetic substance fine copper gauge
(C)paramagnetic substance aluminum
(D)paramagnetic material tantalum

Answer: (A)

Solution

Magnetic shielding works by providing a low-reluctance (high-permeability) path so that the magnetic field lines are diverted through the shield and bypass the enclosed instrument. A soft ferromagnetic material such as soft iron has a very high relative permeability and negligible retentivity, so

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Question ID VK-097806