| The current; in a coil varies with time as shown in the figure. The variation of induced emf with time would be |
 |
A)
B)
C)
D)
Correct Answer: D
Solution :
| We know |
| \[e=-L\frac{di}{di}\] |
| During 0 to \[\frac{T}{4},\frac{di}{dt}=\text{constant}\] |
| So, \[e=-ve\] |
| For \[\frac{T}{4}\] to \[\frac{T}{2},\frac{di}{dt}=0\] |
| \[e=0\] |
| For \[\frac{T}{2}\] to \[\frac{3T}{4},\frac{dt}{dt}=\text{constant}\] |
| \[e=+ve\] |
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