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 . Then the field inside the paramagnetic substance is :
Option: 1
Option: 2 zero
Option: 3 much large than and parallel to
Option: 4 much large than but opposite to
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A perfect diamagnetic substance will completely expel the magnetic field. Therefore, there will be no magnetic field inside the cavity of the sphere. Hence the paramagnetic substance kept inside the cavity will experience no force.