Assignment Set-2

A magnetic needle lying parallel to a magnetic field requires $X$ units of work to turn it through $60°.$ The torque necessary to maintain the needle in this position is

Two magnets of equal magnetic moments $M$ each are placed as shown in figure below. The resultant magnetic moment is $M.$ Then value of $\theta$ is

${\chi }_1$ and ${\chi }_2$ are susceptibility of a diamagnetic substance at temperature, $T_1 \mathrm{K}$ and $T_2 \mathrm{K}$ respectively. Then

For a paramagnetic substance

Which of the following is incorrect?

The magnetic moment of a diamagnetic substance in the absence of external magnetic field is

Domains for motion is not necessary feature of

Two bar magnets having their moment of inertia $I_1 : I_2=2:5$ oscillate in horizontal plane with time periods $T_1$ and $T_2$ as $3 \mathrm{s}$ and $4 \mathrm{s}$ respectively. If ratio of their magnetic moments $\left(\frac{M_1}{M_2}\right)$ is $\frac{N}{45},$ then value of $N$ is _____