Q- Consider the circuit in the figure. The switch is closed for long time prior to t = 0.

(a) Determine the voltage V_{c} across the capacitor before t = 0 and long time after t = 0

(b) Find the expression for the voltage across the capacitor as a function of time

(c) Determine the time constant after the switch is closed

(d) Plot the voltage across capacitor for -2 < t < 5 second