1. The problem statement, all variables and given/known data The current in a series RL circuit increases to 20% of its final value in 3.4μs. If L = 2.0mH, what is the resistance R? 2. Relevant equations I=I_0(1-e^(-t/(L/R))) <----Im not sure if this equation is right? 3. The attempt at a solution I'm unsure how to start this problem, or if I'm on the right track with this equation?