| 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 :
\[e=\frac{BdA}{dt}\] \[=\frac{Bd}{dt}(\pi {{r}^{2}})=B2\pi r\frac{dr}{dt}\]
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