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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