Magnetic shielding is done by surrounding the instrument to be protected from magnetic field by (a) soft ferromagnetic substance soft iron. (b) diamagnetic substance fine copper gauge. (c) paramagnetic substance aluminium. (d) paramagnetic material tantalum.

Answer: (a). Shielding needs a material of very high permeability, so field lines run through the shell and not into the space inside. Soft iron is such a material. Copper, aluminium and tantalum have μr ≈ 1. So the answer is (a) soft ferromagnetic substance soft iron.

Magnetic shielding is done by surrounding the instrument to be… | MHT CET 2023 (13 May, Shift 2)

Q10MHT CET 2023 · 13 MAY · SHIFT 2Easy

Hysteresis, Soft Iron vs Steel & Shielding

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

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Answer: (a)

Shielding needs a material of very high permeability, so field lines run through the shell and not into the space inside.
Soft iron is such a material. Copper, aluminium and tantalum have $\mu_r \approx 1$ .
So the answer is (a) soft ferromagnetic substance soft iron.

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Hysteresis, Soft Iron vs Steel & Shielding question from MHT CET 2023 (13 May, Shift 2)

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