82. The circuit shown in Fig. 19-67 uses a neon-filled
Chapter 19, Problem 82(choose chapter or problem)
82. The circuit shown in Fig. 19-67 uses a neon-filled tube as in Fig. 19-23a. This neon lamp has a threshold voltage VJ, for conduction, because no current flows until the neon gas in the tube is ionized by a sufficiently strong electric field. Once the threshold voltage is exceeded, the lamp has negligible resistance. The capacitor stores electrical energy, which can be released to flash the lamp. Assume that C = 0.150 mF. R = 2.35 x 106H. V0 = 90.0 V and % = 105 V. (a) Assuming that the circuit is hooked up to the emf at time t = 0, at what time will the light first flash? (6) If the value of R is increased, will the time you found in part (a) increase or decrease? (c) The flashing of the lamp is very brief. Why ? (
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