A bar magnet is cut into two equal pieces along its length. The magnetic moment of each piece becomes:

$P$ and $Q$ are two unlike magnetic poles. Induction due to '$P$ at the location of '$Q$' is B. and induction due to '$Q$' at the location of $P$is $B/2$. The ratio of poles strengths of ${\rm{P}}\,{\rm{and}}\,{\rm{Q}}$ is

A bar magnet is cut into two equal halves along its length. The magnetic dipole moment of each half is:

At a certain distance from a short bar magnet, the magnetic field strength is $B$. If the magnet is replaced by another magnet of the same length but double the magnetic moment, the new field strength at the same point will be:

Two identical short bar magnets are placed at a distance $d$ apart with their axes perpendicular to each other. The magnetic field at the midpoint of the line joining their centers is:

The magnetic induction field strength at a distance $0.2\,m$  on the axial line of a short bar magnet of moment $3.6\,A{m^2}$ is

A bar magnet 20 cm in length is placed with it south pole towards geographic north. The neutral points are situated at a distance of 40 cm from centre of the magnet.

If horizontal component of earth’s field $= 3.2 imes {10^{ - 5}}$ T, then pole strength of magnet is

A magnet is parallel to a uniform magnetic field. If it is rotated by $60^\circ$, the work done is 0.8joules. How much additional work is done in moving it $30^\circ$ further

Breaking a bar magnet in half results in:

A magnet of magnetic moment $50\,\hat i\,A{m^2}$ is placed in magnetic field $\vec B = \left( {0.5\,\hat i + 0.3\,\,\hat i} \right)T$. Torque acting on the magnet is

Force between two identical short bar magnets whose centers are $r$ metre apart is 8.1 N, when their axes are along the same line. If separation is increased to 3 $r$ and the axis are rearranged perpendicularly, the force between them would become