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(a) The switch in the circuit shown in Figure 5 has been closed for a long time before it is opened at t = 0. Find the current i(t) through the inductor and voltage v(t) across the inductor for t> 0.. [10 marks) RA w 4 LRC) + Vs 12 V v(t) L 500 mH w R 100 ok Figure 5 (b) For an iron core transformer as shown in Figure 6, calculate the primary current II, primary voltage V1, Secondary current 12, and Secondary voltage V2. Consider that the mutual inductance is j5 ohms. [2.5 x 4=10 marks) I R 3 j50 20 20 V V, 140 S90 V2 w R2 912