Embibe Experts Solutions for Chapter: Matter and Magnetism, Exercise 1: Exercise 1

The square loop $AMCD$ carrying current $I,$ is placed  in a uniform magnetic field $B,$ as shown. The loop can rotate about the axis $XX\text{'}.$ The plane of the loop makes an angle $\theta \left(\theta <90°\right)$ with the direction of $B.$ Through what angle will the loop rotate by itself before the torque on it becomes zero?

A tangent galvanometer has $80$ turns of wire. The internal and external diameters of the coil are $19 \mathrm{cm}$ and $21 \mathrm{cm}$ respectively. The reduction factor of the galvanometer at a place where $H=0.32$ oersted will be ($1$ oersted $=80 \mathrm{A} {\mathrm{m}}^{-1}$)

The certain amount of current when flowing in a properly set tangent galvanometer, produces a deflection of $45°.$ If the current is reduced by a factor of $\sqrt{3},$ the deflection would

If number of turns and radius of cross-section of the coil of a tangent galvanometer are doubled. The reduction factor $k$ will be

The total intensity of the earth's magnetic field at equator is $5$ units. What will be its value at the poles?

The North pole of Earth's magnet is near the geographical

The horizontal component of the earth's magnetic field at a place is $0.25\times {10}^{-4}\mathrm{Wb}/{\mathrm{m}}^2$ and its vertical component is $0.35\times {10}^{-4}\mathrm{Wb}/{\mathrm{m}}^{-4}$. Then the earth's total magnetic field at that place is

Which among the following is correct regarding diamagnetic materials?