A bar magnet of magnetic moment 3.0A−m2 is placed in a uniform magnetic induction field of 2×10−5T. If each pole of the magnetic experiences a force of 6×10−4N, the length of the magnet is:
Magnetic moment is
M=mL
m=ML
∵F=mB
F=MLB
L=MBF
L=3×2×10−56×10−4
L=0.1m
Hence, Length of magnet is 0.1m