question_answer

A bar magnet is cut into two equal halves by a plane parallel to the magnetic axis. Of the following physical quantities the one white remains unchanged is

A)  Pole strength

B)  Magnetic moment

C)  Intensity of magnetisation *-a [c] For each half \[M=m\times 2\,\ell \] becomes half and volume \[V=a\times 21\] also becomes half therefore, I = M/V, remains constant.

D)  Moment of inertia