1.

A perfectly dimagnetic 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:(1) Zero (2) \(\vec{B}\)(3)   much  large than |\(\vec{B}\)| but opposite to \(\vec{B}\)(4)   much  large than |\(\vec{B}\)| and parallel to \(\vec{B}\)

Answer»

(1) Zero 

A perfect diamagnetic substance will completely expel 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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