Question

A coil of inductance 1 h and negligible resistance is connected to a source of supply, whose voltage is given by v=4vv=4v. If the voltage is applied when t=0t=0, then find the energy stored in the coil in 4 s

Answer 1

Option A =512J

From Faraday law v is d(phi) /dt

U =1/2LI^2