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

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answer is 4.

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Detailed Solution

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

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