(b) For the circuit shown in Figure Q2(b), (i) calculate the initial energy stored in the inductor for t < 0 s. (ii) determine the expression of current i(t) for t > 0 s. (iii) draw the graph of i(t) for t > 0 s. Hint: u(-t) = 1 – u(t). 2 H 20Ω i(t) 8u(t) V Зи(-0) А Figure Q2(b)

The switch in the circuit shown in FIGURE Q2 has been closed for a long time. At t = 0 the switch is opened. i. With the switch closed, determine the inductor's initial current, i(0) and with the switch opened, determine the inductor's final current, i(∞) and the time constant. ii. Evaluate whether the circuit is a source - free or step response circuit. Hence, determine the inductor's current, i(t) for t > 0 iii. Discuss how the values of the voltage source and resistors in the circuit, affect the inductor's current, i(t).

1. A voltage is being applied across a 0.2 mH inductor as shown below. The current through the inductor at t = 0 is known to be i(0) = 10.0 A r (mv) 0.2 mH t(s) a. Find the current through the inductor as a function of time for t20 (i.e. find i(t) for t>0). b. Find the energy stored in the capacitor at t=1.5 sec.