1. The problem statement, all variables and given/known data http://imgur.com/a/qlQ5z 2. Relevant equations i=i(o)+1/L integration(v0) dt formula is in the attemp at a solution. 3. The attempt at a solution http://imgur.com/a/HVjl1 For the interval 2<t<infinite . I understand that voltage at 2ms is 0 , but where did they get 2x10^-3? is that the 2ms to seconds? and how did they 50ma after the integration? I only get 10ma not 50. Thanks in advance.