4. Consider a second order RLC circuit with current, i that varies in time, t is subjected to a step voltage, v and is represented as a differntial equation below. Assume the initial value of the current is zero. 8 di(1) dt di(t) 155 +16i(t) = 10v(t) dt a. Obtain the transfer function of the system. b. Determine damping ration, undamped and damped natural frequencies for a unit step input. (10 marks)