The space around the magnet in which another magnetic pole placed experiences a magnetic force is the region of magnetic field.
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
When a bar magnet of magnetic moment ¯¯¯¯¯¯M is placed in a magnetic field of induction field strength ¯¯¯¯B, each pole experiences a force of ¯¯¯¯F then the distance between the South and North pole of the magnet measured inside it is :