If the magnetic dipole of moment of an atom of diamagnetic material, paramagnetic material and ferromagnetic material are donated by `mu_d, mu_p` and `mu_f` respectively, then:

Options

A. `mu_(d) ne 0` and `mu_(f) ne 0`
B. `mu_(p) ne 0` and `mu_(f) ne 0`
C. `mu_(d) ne 0` and `mu_(p) ne 0`
D. `mu_ ne 0` and `mu_(p) ne 0`

Answer

B

Explanation

In diamagnetic substances in each pair of electrons, the spins of both the electrons are in opposite directions. Hence, the electrons of each other. Thus the net magnetic moment of each atoms of such substances is zero, i.e., `mu_(d)=0`.

The property of paramagnetism is found in those substances whose atoms or molecules have an excess of electrons spinning in the same direction.
Hence, atoms of paramagnetic substance have permanent magnetic moment, i.e., `mu_(P) ne 0`.
The property of ferromagnetism is found in substances which acquire very strong magnetism when placed in an external magnetic field. Like the paramagnetic substances each atom of ferromagnetic

substance also has a permanent magnetic moment, i.e., `mu_(f) ne 0`.