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 $\overrightarrow B $ . Then the field inside the paramagnetic substance is :

Question

$\overrightarrow B $

zero

much large than $\left| {\overrightarrow B } \right|$ and parallel to $\overrightarrow B $

much large than $\left| {\overrightarrow B } \right|$ but opposite to $\overrightarrow B $

Solution

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