A short bar magnet of magnetic moment 255 ${\rm{J}}{{\rm{T}}^{ - 1}}$ is placed with its axis perpendicular to earth’s field direction. At what distance from the center of the magnet, the resultant field is inclined at $45^\circ$ with earth’s field, $H = 0.4 imes {10^{ - 4}}{\rm{\;T\;}}?$

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.

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

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

For an isotropic medium $B,\;\mu ,\;H$ and $M$ are related as (where $B,\;{\mu _0},\;H$ and $M$ have their usual meanings in the context of magnetic material)

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

A small compass is placed near the north pole of a bar magnet. In which direction will the north pole of the compass point?

The magnetic field is strongest at which point of a bar magnet?

The magnetic field lines due to a bar magnet:

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.