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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:

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zero

much larger than $| \vec{B} |$ but opposite to $\vec{B}$

much larger than $| \vec{B} |$ and parallel to $\vec{B}$

$\vec{B}$

answer is B.

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Detailed Solution

A perfect diamagnetic substance will completely repel the magnetic field . Therefore, there will be no magnetic field inside the cavity of sphere. Hence the paramagnetic substance kept inside the cavity will experience no force.

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