(a) The op amp in Figure Q4.a is ideal. (1) (ii) Find the transfer function H(s) = Vo(s)/V;(s). Given that C = 62.5 nF, C = 12.5 nF, R = 4 KQ, R = 10 KQ V;(t) = 800t xu(t) Capacitors have no charge at t = 0 Find V. (t) for t 0. + 150V Vin (t) 202 C1 28V R1 40 A wo switch 1 B C2 80 3 Figure Q4.a (b) In the circuit in Figure Q4.b, switch 1 is at position A and switch 2 is closed for a long time. At t = 0 switch 1 is moved to position B and switch 2 is open. (1) Determine the initial values of i(t) and v(t), i.e., i(0) and v(0). (ii) Find i(t) for t 0. R2 Figure Q4.b 8 100 mH i(t) + V (t) - (15 marks) v(t) 2 mF (15 marks) Coo C switch 2 180