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Magnetic flux φ (in weber) linked with a closed circuit of resistance 10 Ω varies

Magnetic flux φ (in weber) linked with a closed circuit of resistance 10 Ω varies with time t (in sec) as φ=5t²-4t+1. The induced e.m.f. in the circuit at 0.2 sec is

Options

(a) 0.4 volt
(b) 2.0 volt
(c) (-0.4 volt)
(d) (-2.0 volt)

Correct Answer:

2.0 volt

Explanation:

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