A) Zero
B) \[2\pi \,r\,i\,B\]
C) \[\pi \,{{r}^{2}}\,i\,B\]
D) \[2\pi \,{{r}^{2}}\,i\,B\]
Correct Answer: C
Solution :
As shown in the following figure, the given situation is similar to a bar magnet placed in a uniform magnetic field perpendicularly. Hence torque on it \[\tau =MB\sin 90{}^\circ =(i\pi {{r}^{2}})B\]You need to login to perform this action.
You will be redirected in
3 sec