The current in a 20 mh inductor is known to be i 40 ma , e 0; the voltage across

The current in a 20 mh inductor is known to be i 40 ma , e 0; the voltage across the inductor (passive sign con- vention) is 28 v at t = 0. a) find the expression for the voltage across the inductor fort > 0. b) find the time, greater than zero, when the power at the terminals of the inductor is zero.