The name 'magnet' came from which island?

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

Three identical bar magnets are riveted together at the centre in the same plane as shown in the figure. This system is placed at rest in a slowly varying magnetic field. It is found that the system of magnets does not show any motion. The north-south poles of one magnet are shown in the figure. Determine the poles of the remaining two.

$A$ wire of magnetic moment $M$ is bent to form a circular arc which subtends an angle $90^o$ at the center. Then,its new magnetic moment is:

The unit of magnetic moment is

What happens to the force between two magnetic poles when their pole strength and the distance between them are both doubled?