If a bar magnet of pole strength `'m'` and magnetic moment `'M'` is cut equally `4` times parallel to its axis and `5` times perpendicular to its axis then the pole strength and magnetic moment of each piece are respectively

Options

A. `(m)/(20),(M)/(20)`
B. `(m)/(4),(M)/(20)`
C. `(m)/(5),(M)/(20)`
D. `(m)/(5),(M)/(4)`

Answer

C

Explanation

`m^(1)=(m)/(5),M^(1)=(M)/(5xx4)`