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A bar magnet of length l and magnetic dipole moment M is bent to form an arc which subtends an angle of 120° at centre. The new magnetic dipole moment will be
Initial dipole moment = m=m.l m=pole strength arc=angle×radius l=π3×r r=3lπNow, as the distance b/w poles = rNew dipole moment = m×r = m×3lπ =m×l×3π =3mπ