Q.
If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material are denoted ny μd,μp and μf respectively, then
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AIPMTAIPMT 2005Magnetism and Matter
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Solution:
Magnetic moment of ferromagnetic material μf is non-zero always.
Under application of external magnetic field, the paramagnetic material has all the magnetic moments aligned giving off μp≡0.
However the magnetic moments of atoms in diamagnetic material cancels out resulting in μd=0