Savchenko Problem 8.4.16

Physics · electromagnetism

Problem

The neon lamp is switched on using the scheme shown in the figure. After closing the key, the capacitor will start charging. When the voltage across the capacitor reaches a certain value V, the lamp will light up. The minimum voltage across the lamp at which it is still lit is 80 V, and the current through the lamp is 1 mA. Battery EMF 120 V, 80 V < V < 120 V. At what resistance will the lamp be permanently lit (will not go out)?

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