The magnetic induction at distance of 0.1 m from a strong magnetic pole of strength 1200 A.m is
A magnet of magnetic moment 1.525×10−3A.m2. is placed in a magnetic field of induction field strength 0.1gauss, perpendicular to the field direction. Then each pole experiences a force of 0.305dynes. The distance between the two poles of the magnet is
The magnetic induction at a distance ‘d’ from the magnetic pole of the unknown strength ‘m’ is B. If an identical pole is now placed at a distance of 2d from the first pole, the force between the two poles is