Question

The force experienced by a pole of strength 100A−m at a distance of 0.2m from a short magnet of length 10cm and pole strength 100A−m on its axial line will be

Answer 1

F = mB

=μ04π×2m′lx3×m

=10−7×2×100×0.1×1008×10−3

=2.5×10−2N