1. The problem statement, all variables and given/known data I have managed to calculate the first part of the question but the second part b I keep getting wrong. I was wondering whether you might give me some guidance. I am trying to find the current after 50s in part b below. 2. Relevant equations time constant = RC 3. The attempt at a solution a) Time constant = RC = (50 x 10-6 F) x (100, 000Ω) Time constant = (5 x 10-5 F) x (100, 000Ω) Time constant = 5s Correct b) T1/2 = 5 x In 2 = 3.4657... 50 seconds corresponds to 50/3.4657 = 14.41 half-times. Δ changing current 14.41t1/2 = 90µA/2^14.41 = 4.13 x 10^-3 µA = 4.13 x 10^-6A Current after 50 seconds is 4.13 x 10^-6A This is wrong. Help. Thanks.