Question: Shows a simplified circuit for a photographic flash unit. This circuit consists of a 9.0-V battery, a 50.0-k resistor, a 140-(F capacitor, a flashbulb, and

Shows a simplified circuit for a photographic flash unit. This circuit consists of a 9.0-V battery, a 50.0-kÎ© resistor, a 140-(F capacitor, a flashbulb, and two switches. Initially, the capacitor is uncharged and the two switches are open. To charge the unit, switch S1 is closed; to fire the flash, switch S2 (which is connected to the camera's shutter) is closed. How much time does it take to charge the capacitor to 5.0 V?

Figure 21-54,

9.0V S2 50.0 kn 140 F

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