| Radius of a circular ring is changing with time and the coil is placed in uniform constant magnetic field perpendicular to its plane. The variation of \['r'\] with time \['t'\] is shown in the figure. Then induced e.m.f. \[\varepsilon \] with time will be best represented by. |
 |
A)
B)
C)
D)
Correct Answer: A
Solution :
\[e=\frac{BdA}{dt}=\frac{Bd}{dt}(\pi {{r}^{2}})=B2\pi r\frac{dr}{dt}\]
You need to login to perform this action.
You will be redirected in
3 sec
