1. The problem statement, all variables and given/known data The current in a 4.70 mH inductor decays over time according to the following function, where t is in seconds. I(t) = (.943A) e-(396 s-1) t) (a) What is the induced emf across the inductor at t= 5.00 ms? (b) How long does it take the emf to drop below 1.25 mV? 3. The attempt at a solution Since emf = -L(dI/dt) , I can take the derivative of the function above and plug in t=.005, right? I' = (.943A) e-(396 s-1) t) (-1/396s) Plug in t=.005 and I get I' = -.00238 emf = -L(dI/dt) emf = -(.0047)(-.00238) = 1.119x10-5 I tried this answer but it was incorrect. What am I doing wrong?