Figure shows two small bar magnets having dipole moments `M_(1)` and `M_(2)` placed at separation r. Find the magnetic interaction energy of this system of dipoles for `d lt lt r`.

Figure shows two identical magnetic dipoles a and b of magnetic moments M each, placed at a separation d , with their axes perpendicular to each other. Find the magnetic field at the point P midway between the dipoles.

A bar magnet of magnetic dipole moment 8 Am^(2) has poles separated by 0.4 m . Find the pole strength of bar magnet .

Two short magnets of equal dipole moments M are fastened perpendicularly at their centres Find the effective magnetic moment.

Two short dipoles , each of dipole moment P are placed at a large separation r . The force between them

Two small magnets X and Y of dipole moments M_(1) and M_(2) are fixed perpendicular to each other with their north poles in contact. This arrangement is placed on a floating body so as to move freely in earth's magnetic field as shown in figure then the ratio of magnetic moment is

The torque acting on a magnetic dipole of moment P_(m) when placed in a magnetic field is