The distance between two poles of magnets is called as

The line joining the two poles of a magnet is called as

The distance between two magnetic pole is doubled and the pole strength of each is halved, the force between them will be

When distance between two given magnetic poles is halved, force between them becoems k times, where k=

The distance between the poles of a horse shoe magnet is 0.1 m and its pole strength is 0.01 amp-m. The induction of magnetic field at a point midway between the poles will be