Question

The current through a series RL circuit, subjected to a constant emf $\epsilon$, obeys $L\frac{di}{dt}+iR=\epsilon$. Let L=1mH, R=1k$\Omega$ and $\epsilon$=1V. The initial condition is i(0)=0. At t=1$\mu s$, the current in mA is

• A. 1-2e-2
• B. 1-2e-1
• C. 1-e-1
• D. 2-2e-1

Answer 1

Answer: (C)

1-e-1

Answer 2

The correct answer is (C) : 1-e-1