Question 337: Electromagnetic Induction

Question

The current $i$ in a coil varies with time as shown in the figure. The variation of induced emf with time  would be
![](https://neetcare-image.cdn.examgoal.net/1qpqahkk7xd6ato/354d3bcd-7646-4632-b4e7-41ba8017f43d/bb4bcfd0-691c-11ea-aedc-f1c8d8e0194b/file-1qpqahkk7xd6atp-500w.jpg)

Accepted Answer

e = -L${{di} \over {dt}}$
During 0 to ${T \over 4}$, ${{di} \over {dt}}$ = constant
$ 	herefore $ e = -ve
During ${T \over 4}$ to ${T \over 2}$, ${{di} \over {dt}}$ = 0
$ 	herefore $ e = 0
During ${T \over 2}$ to ${3T \over 4}$, ${{di} \over {dt}}$ = 0
$ 	herefore $ e = +ve
Thus graph given in option (a) represents the variation of induced emf with time.

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Answer

Electromagnetic Induction

The current i in a coil varies with time as shown in the figure. The variation of induced emf with time would be

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