Electro Magnetic Induction And Alternating Currents Question 388
Question: Magnetic flux f (in weber) linked with a closed circuit of resistance 10 ohm varies with time t (in seconds) as $ \varphi =5t^{2}-4t+1 $ The induced electromotive force in the circuit at t = 0.2 sec. is [MP PMT 2001]
Options:
A) 0.4 volts
B) ? 0.4 volts
C) ? 2.0 volts
D) 2.0 volts
Show Answer
Answer:
Correct Answer: D
Solution:
$ e=-\frac{d\varphi }{dt}=-(10t-4) $
Þ $ {{(e)}_{t=2}}=-(10\times 0.2-4)=2\ volt $
