The deflection magnetometer is most sensitive when deflection ${\rm{heta }}$ is

The magnetic field due to a small magnetic dipole of magnetic moment $M$, at distance $r$ from the centre on the equatorial line is given by (in M.K.S system)

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

The distance of two points on the axis of a magnet from its centre is $10\;cm$ and $20\;cm$ respectively. The ratio of magnetic intensity at these points is $12.5\;:1$. The length of the magnet will be

Direction of magnetic field at equatorial point is

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, $H = 0.4 imes {10^{ - 4}}{\rm{\;T\;}}?$

A short bar magnet is placed with its north pole pointing towards geographic north. The neutral point is located:

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 deflection magnetometer is most sensitive when deflection ${\rm{heta }}$ is

The magnetic field at a point $x$ on the axis of a small bar magnet is equal to the field at a point y on the equator of the same magnet. The ratio of the distances of $x$ and $y$ from the centre of the magnet is