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The magnetic flux through a loop of resistance 10 ? is given by f = 5t 2 – 4t + 1 Weber. How much current is induced in the loop after 0.2 sec ? (A) 0.4 A (B) 0.2 A (C) 0.04 A (D) 0.02 A

aniket anand , 12 Years ago
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Arun
Given that,
Magnetic flux ϕ=5t2−4t+1
Time t=0.2sec
Now, the induced e. m. f in the circuit
E=−dtdϕ​
E=−dtd(5t2−4t+1)​
E=−10t+4
Now, at t=0.2 s
E=−10×0.2+4
E=2V
Hence, the induced emf in the circuit is 2 V
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Vikas TU
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