A) \[M\]
B) \[M/2\]
C) \[M/4\]
D) \[2M\]
Correct Answer: B
Solution :
If cut along the axis of magnet of length l, then new pole strength \[{m}'=\frac{m}{2}\]and new length \[{l}'=l\] \[\therefore \]New magnetic moment \[{M}'=\frac{m}{2}\times l=\frac{ml}{2}=\frac{M}{2}\] If cut perpendicular to the axis of magnet, then new pole strength \[{m}'=m\] and new length, \[{l}'=l/2\] \[\therefore \] New magnetic moment \[{M}'=m\times \frac{l}{2}=\frac{ml}{2}=\frac{M}{2}\]You need to login to perform this action.
You will be redirected in
3 sec