Magnetism and M...

If the magnet is cut into four equal parts such that their lengths and breadths are equal. Pole strength of each part is

Magnetic moment of bar magnet is M. The work done to turn the magnet by 90° of magnet in direction of magnetic field B will be

A current carrying small loop behaves like a small magnet. If A be its area and M its magnetic moment, the current in the loop will be

The magnetism of a magnet is due to

If a bar magnet of length l and cross-sectional area A is cut into two equal parts as shown in figure, then the pole strength of each pole becomes

A bar magnet is held at a right angles to a uniform magnetic field. The couple acting on the magnet is to be halved by rotating it from this position. The angle of rotation is

A magnetic needle is kept in a non-uniform magnetic field. It experiences

Direction of magnetic field at equatorial point is

Consider a short magnetic dipole of magnetic length 10 cm. Its geometric length is

If a magnetic dipole of dipole moment M rotated through an angle θ with respect to the direction of the field H, then the work done is