A bar magnet of length 'l' and magnetic dipole moment 'M' is bent in the form of an arc as shown in figure. The new magnetic dipole moment will be

Let m be strength of each pole of bar magnet of length l.Then M=m×l          −−−iWhen the bar magnet is bent in the form of an arc as shown in figureThen l=π3×r=πr3   or  r=3lπNew magnetic dipole momentM'=m×2rsin300 =m×2×3lπ×l2=3mlπ=3Mπ        Using i