Question

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

• A. $\text{OD}$
• B. $\text{OC}$
• C. $\text{OB}$
• D. $\text{OA}$

Answer 1

The correct option is B $\text{OC}$

For diamagnetic material, the intensity of magnetization is,

$I=\chi H$

Where,

$\chi \to$ magnetic susceptibility

Also, for diamagnetic material, $\chi =-ve\&\text{very small}$

So, $I$ vs $H$ curve must be a line with negative slope.

So the answer might be $\text{OC}$ or $\text{OD}$. But we know for the diamagnetic materials $\chi$ is very small.

So, slope of the line must be very less, that is why more appropriate graph will be $\text{OC}$.

Hence, $\left(B\right)$ is the correct option.