A) ? 40 V
B) 40 V
C) 140 V
D) 300 V
Correct Answer: B
Solution :
\[e=-\frac{d\varphi }{dt}=-\frac{d}{dt}\left( 5{{t}^{3}}-100t+300 \right)\] \[=-(15{{t}^{2}}-100)\] at t = 2sec ; e = 40 V
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