If the magnetic dipole moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material are denoted by µ_d, µ_p and µ_frespectively, then

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$μ_{d} = 0 and μ_{p} \neq 0$

$μ_{d} \neq 0 and μ_{p} = 0$

$μ_{p} = 0 and μ_{f} \neq 0$

$μ_{d} \neq 0 and μ_{f} \neq 0$

answer is A.

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Detailed Solution

Materials with no unpaired, or isolated electrons are considered diamagnetic. Diamagnetic substances do not have magnetic dipole moments and have negative susceptibilities. However, materials having unpaired electrons whose spins do not cancel each other are called paramagnetic. These substances have positive magnetic moments and susceptibilities. Magnetic moment of ferromagnetic material μ_f is non-zero always.

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