A) + 1 V
B) ? 1 V
C) + 1 mV
D) ? 1 mV
Correct Answer: D
Solution :
\[e=-L\frac{di}{dt}=-0.4\times {{10}^{-3}}\times \frac{250\times {{10}^{-3}}}{0.1}=-1\ mV\]
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