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

In the case of a bar magnet,lines of magnetic induction:

$A$ metal wire of length $l$ has a magnetic moment $M$. What is the new magnetic moment if it is bent into an $L$-shape?

Verify Ampere's law for the magnetic field of a point dipole with dipole moment $\vec{M} = M\hat{k}$. Take $C$ as the closed curve running clockwise along the $x$-axis from $x = R$ to $x = a$,then along a circular arc of radius $r$ in the $xz$-plane from $\theta = 0$ to $\theta = \pi$,and finally back to the starting point.

$A$ short bar magnet has a magnetic moment of $0.48 \, J \, T^{-1}$. The magnitude of magnetic field at a point at $10 \, cm$ distance from the centre of the magnet on its axis 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