Question

Q24 Which of the following option is correct for a diamagnetic material?
(a) . >1,44 > 1
(b) 4, >1, X. <1.
(c) <1, X. <0
(d) <1, X. > 0​

Answer 1

Answer:

The values of relative permeability of diamagnetic materials are slightly less than 1 and ε

r

is quite high. According to the table given, one takes ε

r

=1.5 and μ

r

=0.5. Then the choice (c) is correct.

Answer 2

Answer:

Value of diamagnetic susceptibility is negative and magnetic permeability always less than one.

Explanation:

• Diamagnetic materials are the materials that are usually repelled by a magnetic field.
• To be precise, the atoms in a diamagnetic material have no magnetic moment when there is no applied field. This is due to the distortion of the electron orbital motion by the applied field.
• These materials generally have an even number of electrons, hence, the magnetic effects due to the up- and down-spin of electrons tend to cancel out each other .
• The value of diamagnetic susceptibility, $\chi$ is independent of temperature and always negative, given by

                                $1+\chi=\mu_{r}$  

• Therefore, the resultant magnetic permeability, $\mu_{r}$ in diamagnetic materials is always less than one$(\mu_{r} < 1)$.
• As the options are not clear, values are given but cant choose the answer.