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:

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:

A small bar magnet has a magnetic moment $1.2\;A$-${m^2}.$ The magnetic field at a distance $0.1\;m$ on it axis will be: $({\mu _0} = 4\pi imes {10^{ - 7}}$-$m/A)$

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 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 bar magnet of magnetic moment $M$ is bent into a semicircle. The new magnetic moment is:

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

A small bar magnet has a magnetic moment $1.2\;A$-${m^2}.$ The magnetic field at a distance $0.1\;m$ on it axis will be: $({\mu _0} = 4\pi imes {10^{ - 7}}$-$m/A)$

Two small magnets each of magnetic moment 10 A-${m^2}$ are placed in end-on position $0.1\;m$ apart from their centres. The force acting between them 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 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: