Consider the circuit shown below, where the capacitor is initially uncharged and the switch is then set to position a. The switch remains in this position until the capacitor is fully charged. At time t = 0.0 s, the switch is returned to position b . Ro R1 C S b Vo a At t = 20.0 s, how much energy is stored in capacitor? Given Vo = 10 V, C = 7 F. R1 = 3 0, and R2 = 15 0. Answer in units of J