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Q.

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 :

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a

much large than  B but opposite to  B

b

zero

c

much large than  B and parallel to  B

d

B

answer is D.

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Detailed Solution

Diamagnetic substances does not allow any magnetic field lines to pass through them. Therefore magnetic field inside it must be zero

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