The magnetic induction in air at a distance $d$ from an isolated point pole of strength $m$ unit will be:

The magnetic field lines due to a bar magnet are correctly shown in

The magnetic dipole moment of a short magnetic dipole at a distant point along the equator of the magnet has a magnitude of $X$ in $SI$ units. If the distance between the point and the magnet is halved,then the magnitude of the dipole moment will be

Magnetic dipole moment is a

If a bar magnet of pole strength $m$ and magnetic moment $M$ is cut equally $5$ times parallel to its axis and again $3$ times perpendicular to its axis, then the pole strength and magnetic moment of each piece are respectively

If a hole is made at the centre of a bar magnet,then its magnetic moment will