Here is a simplified (oversimplified) model of a circuit for a camera flash. The resistance R1 is considerably larger than R2. When the switch is at a, the capacitor C slowly recharges. When the switch is at b, C rapidly discharges. b M V с R2 R (b) What is the power dissipated by R2 immediately after the switch is flipped to b? Explain, using this, why a flash requires a small value for R2. (c) Say C = 12 pF, and R2 = 0.21 N. How long will it take for the capacitor to discharge 90% of its starting charge?