General Physics

DIELECTRICTS

PROBLEM 1: The energy stored in a capacitor with capacitance C, and an electric potential difference, AV, is represented by U = 1/2 C AV2. One application of this is in the electronic photoflash of a strobe light. In such a unit, a capacitor of 10.0 uF is charged to 3.0 x 102 V. Find the energy stored * 2, Suppose it took 25 s to charge the capacitor in problem 1. a. Find the average power required to charge the capacitor in this time. * When this capacitor is discharged through the strobe lamp, it transfers all its energy in 1.0 x104 3. Find the power delivered to the lamp. * 4 Lasers are used to try to * produce controlled fusion reactions. These lasers require brief pulses of energy that are stored in large rooms filled with capacitors. One such room has a capacitance of 0.061 F charged to a potential difference of 10.0 W. a. Given that U = V2 C AV2. find the energy stored in the capacitors. b. The capacitors are discharged in 10 ns (1.0x10-8 5). What power is produced? c. If the capacitors are charged by a generator with a power capacity of 1.0 kW, how many seconds will be required to charge the capacitors? * O E: 1.05 x10"6J, P= 1.05x10A14J. t = 1.05 x10"3 seconds E = 4.05 x10"6 J, P = 3.05 x10"14 J, t = 6.05 x10"3 seconds E = 4.05 x10"6 .J. P = 4.05 x10"14 J, t = 4.05 x10"3 seconds E = 3.05 X10"6 J. P = 3.05 x10"14 J, t = 3.05 x10"3 seconds 000