If m is magnetic pole strength and 2l is distance between them, the magnetic moment M =2ml.

It is clear that cutting the bar magnet in two equal parts ,each half will have magnetic moment =M/2. This is because, cutting the bar magnet in pieces , it's pole strength does not change.( if the cut is perpendicular to the axis of bar magnet.)

A solenoid also behaves like a bar magnet. If current I is passing through a solenoid of length l with n turns per unit length and area of cross section ,A, the magnetic moment of the solenoid is

M=nl IA.

So , cutting this solenoid in two equal halves ,each half will have magnetic moment = M/2.