A bar magnet of length l, pole strength 'p' and magnetic moment `overset(to)(m)` is split `(l)/(2)` · to two equal pieces each of length. The magnetic moment and pole strength of each piece is respectively ....... and ....... .

Options

A. `overset(to)(m), (p)/(2)`
B. `(overset(to)(m) )/( 2), p`
C. `(overset(to)(m) )/(2) , (p)/(2)`
D. `overset(to)(m) , p`

Answer

B

Explanation

When a bar magnet of length l is broken into two parts each of length `(l)/(2)`, each part (fragment) of the magnet behaves as an independent magnet. So the pole strength p does not change but its magnetic dipole moment becomes halved.