what is the total inductance of the inductor combination as shown in f

Question

What is the total inductance of the inductor combination as shown in Figure Q1(a)?
(b) A RC network supplied with 50V battery is shown in Figure Q1(b):
1. If the switch is moved to the position 1, calculate the time taken by the capacitorC1 to get fully charge status, maximum current flow through R1 and the time-constant of the circuit.[6 Marks] After the capacitor get fully charged, move the switch to position 2 of Figure Q1(b)and write down the mathematical expressions for the transient behaviour of vc, icand VR. Plot the curves of Vc, ic and VR.[12 Marks]