JEE Main 2022 · 25 Jul · Shift 2 · Physics Q60

← JEE Main 2022 · 25 Jul · Shift 2

PhysicsInteger+4 / -1Question 60 of 90

Magnetic flux (in weber) in a closed circuit of resistance 20 $\Omega$ varies with time t(s) as $\phi=8t^2-9t+5$ . The magnitude of the induced current at $t=0.25$ s will be ______ mA.

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Answer and worked solution

Official answer: 250

emf $\left|\frac{d\phi}{dt}\right|=|16t-9|=5$ V at 0.25 s: $I=\frac5{20}=250$ mA.

Answer: 250

Topics:Faraday's and Lenz's laws

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JEE Main 2022 · 25 Jul · Shift 2, Physics question 60