Flux ϕ (in weber) in a closed-circuit of resistance 10 ohm varies with time t (in sec) according to the equation : ϕ= 6t2-5t+1What is the magnitude of the induced current at t = 0.25 s ?

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1.2 A

0.8 A

0.6 A

0.2 A

answer is D.

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Detailed Solution

dΦdt= 12t - 5 At t=0.25 s, e= -2 Induced current= 2/10= 0.2A

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