A coil of resistance 400 is placed in a magnetic field. If the magnetic flux (Wb) linked with the coil varies with time t ( sec )as =50t^2+4. The current in the coil at t=2 secis

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Correct answer: A. (a) Here, =50t^2+4 Wb ,R=400 Induced emf , =- d dt=- d dt(50t^2+4)=-100 tV At t=2s , =-200V ( )=200V Induced current in the coil at t=2s is I= ( )R= 200V400 = 12A=0.5A

$A coil of resistance 400 Ω is placed in a magnetic field. If the magnetic flux ϕ (Wb) linked with the coil varies with time t (sec) as ϕ = 50 t^{2} + 4 . The current in the coil at t = 2 sec is$

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