Two short magnets with their axes horizontal and perpendicular to the magnetic meridian are placed with their centres $40\, cm$  east and $ 50\,cm$  west of magnetic needle. If the needle remains undeflected, the ratio of their magnetic moments ${M_1}:{M_2}$ is

Points $A$ and $B$  are situated along the extended axis of $2\, cm$  long bar magnet at a distance $x $ and $2x$ $ cm$  respectively. From the pole nearer to the points, the ratio of the magnetic field at $ A$ and $B$ will be

Two bar magnets having same geometry with magnetic moments $M$ and $2 M$, are firstly placed in such a way that their similar poles are same side then its time period of oscillation is $T_{1}$. Now the polarity of one of the magnet is reversed then time period of oscillation is $T_{2},$ then

The magnetic potential at a point on the axial line of a bar magnet of dipole moment $M$ is $V$. What is the magnetic potential due to a bar magnet of dipole moment $\frac{M}{4}$ at the same point

The small magnets each of magnetic moment $10 \,A-m^2$ are placed end-on position $0.1\,m$  apart from their centres. The force acting between them is....$N$

Show the magnetic field of bar magnet in a panoramic way.