The magnetic dipole moment of a bar magnet is directly proportional to volume of the bar magnetic . You are given a bar magnet of length I , magnetic pole strength m and magnetic dipole moment M . What will be the effect on dipole moment and pole strength if the bar magnet is cut into the two equal pieces ?
(i) Along it length ?
(ii) Transverse to its length ?

Explanation

In each case , volume is halved , so magnetic dipole moment is halved .
Now , pole strength m = `(M)/(I)` . So , it depends on magnetic dipole moment as well as length .
(i) In first case , length remains same but magnetic dipole moment is halved , so pole strength will be halved .
(ii) In second case , both length as well as magnetic dipole moment are halved , so pole strength remains same .