consider the dual circuit where the value of the inductor is L=1H, the initial current in the inductor is iL(0)=-1amps, and the input is the source vs(t). Let vs(t)=u(t)=u(t-1). Plot the corresponding current iL(t) for all times. Double the voltage source vs(t)=2[u(t)-u(t-1)], and plot the corresponding current in the inductor iL(t) for all times. Compare the two currents and determine if the inductor with the initial current is linear. What if iL(0)=0?