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Q.

Magnetic flux ϕ(in weber) linked with a closed circuit of resistance 10 ohm varies with time t (in seconds) as                ϕ=5t2−4t+1The induced electromotive force in the circuit at t = 0.2 sec. is

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a

0.4 volts

b

– 0.4 volts

c

– 2.0 volts

d

2.0 volts

answer is D.

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Detailed Solution

e=−dϕdt=−(10t−4)⇒(e)t=2=−(10×0.2−4)=2volt
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