K K Sharma Solutions for Chapter: Magnetism and Matter, Exercise 5: Bar Magnet

A cylindrical rod magnet has a length of $5 \mathrm{cm}$ and a diameter of $1 \mathrm{cm}$. It has a uniform magnetisation of $5.30\times {10}^3 \mathrm{A} {\mathrm{m}}^{-3}$. What is its magnetic dipole moment?

Two magnets of equal mass are joined at right angles to each other as shown. The magnet $1$ has a magnetic moment $3$ times that of magnet $2.$ This arrangement is pivoted so that it is free to rotate in the horizontal plane. In equilibrium, what angle will the magnet $1$ subtend with the magnetic meridian?

Two magnets $A$ and $B$ are identical and these are arranged as shown in the figure. Their length is negligible in comparison to the separation between them. A magnetic needle is placed between the magnets at point $P$ which gets deflected through an angle $\theta$ under the influence of magnets. The ratio of distance $d_1$ and $d_2$ will be 

Two short magnets of equal dipole moments $M$, are fastened perpendicularly at their centre (figure). The magnitude of the magnetic field, at a distance $d$ from the centre, on the bisector of the right angle, is 

A value of current gives a $45°$ deflection in properly arranged tangent galvanometer. If the current becomes $\frac{1}{\sqrt{3}}$of its initial value, then deflection in it 

The magnet of a vibration magnetometer is heated so as to reduce its magnetic moment by $19\%$. By doing this, the periodic time of the magnetometer will

Which graph may best represent the current vs deflection curve in a tangent galvanometer?

A magnetic needle lying parallel to a magnetic field requires $W$ unit(s) of work to turn it through $60°$. The torque needed to maintain the needle in this position will be,