A short bar magnet placed with its axis at 30° with an external field of 800 G experiences a torque of 0.016 Nm. The magnetic moment of the magnet is:

A short bar magnet placed with its axis at 30° with an external field of 800 G experiences a torque of 0.016 Nm. The magnetic moment of 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

The magnetic field due to a short magnet at a point on its axis at distance $X\;cm$ from the middle point of the magnet is $200\;gauss$. The magnetic field at a point on the neutral axis at a distance $X\;cm$ from the middle of the magnet is

A short bar magnet of magnetic moment $M$ is placed in a non-uniform magnetic field $B$. If the gradient of the field is $\frac{dB}{dx}$ along the axis of the magnet, the force on the magnet is:

A magnetic dipole of moment $M$ is aligned at an angle $heta$ with a uniform magnetic field $B$. The work done in rotating it by an angle $dheta$ is:

The magnetic field of a small bar magnet varies in the following manner by the influence of a magnet placed at a large distance $d$.

$P$ 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

$P$ 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

Breaking a bar magnet in half results in:

The length of a magnet of moment $5\,A{m^2}$ is $14\,cm$. The magnetic induction of a point, equidistance from both the poles is {\rm{3}}.{\rm{2}}{\mkern 1mu}  imes {\mkern 1mu} {\rm{1}}{{\rm{0}}^{ - 5}}\,\,{\rm{wb/}}{{\rm{m}}^2}. The distance of the point from either pole is.