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A perfectly diamagnetic sphere has a small spherical cavity at its centre, which is filled with a paramagnetic substance. The whole system is placed in a uniform magnetic field B⃗. Then the field inside the paramagnetic substance is

Asked in JEE Main 3rd Sept 2nd Shift 2020 · Dia, para and ferromagnetism

Answer: (2) Zero

Step-by-step solution

A perfect diamagnet (χ = -1) expels all field from its interior.

The cavity is shielded, so no field reaches the paramagnetic core.

A paramagnet with no applied field has no magnetisation, so the field is zero.

Why the other options are wrong

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