Question

The variation of the intensity of magnetisation ($I$) with respect to the magnetising field ($H$) in a diamagnetic substance is described by the graph in figure :

• A. OD
• B. OC
• C. OB
• D. OA

Answer 1

Answer: (B)

OC

Intensity of magnetization $I=\chi H$ where $\chi$ is the magnetic susceptibility

For diamagnetic substances, $\chi$ is negative but has magnitude very very small than 1.

Slope of $I$ Vs $H$ graph for diamagnetic substance is very small in magnitude but negative.

Hence option B is correct.