Exam Questions Papers - Engineering

Q1:

In the circuit shown, in switch S is open for a long time and is closed at t = 0. The current i(t) for t ≥ 0+ is

A i(t) = 0.5 - 0.125e-1000t A

B i(t) = 1.5 - 0.125e-1000t A

C i(t) = 0.5 - 0.5e-1000t A

D i(t) = 0.375e-1000t A

ANS:A - i(t) = 0.5 - 0.125e-1000t A

i(f) = 0.5, i(i) = 0.75 i(t) = Vr + (ii - ij)e-1/p = 0.5 - 0.125e-1000t .