JEE Main · 2020 · 03 Sep 2020 · Shift 2 · Magnetic Properties of Matter

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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

B

. Then the field inside the paramagnetic substance is:

(A)zero✓ Correct
(B)much large than $∣ B ∣$ but opposite to $B$
(C) $B$
(D)much large than $∣ B ∣$ and parallel to $B$

Answer: (A)

Solution

A perfect diamagnet expels magnetic field completely from its interior, the Meissner effect, so within the diamagnetic material the field is zero. The paramagnetic filling sits in a cavity wholly enclosed by that diamagnetic shell, so no external field can reach it. The field inside the paramagnetic substance is zero.

JEE Main · 2020 · 03 Sep 2020 · Shift 2 · Single correct option

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