The charging circuit for the flash system of a camera uses a 100 F capacitor that is

Question:

The charging circuit for the flash system of a camera uses a 100 μF capacitor that is charged from a 250 V power supply. What is the most resistance that can be in series with the capacitor if the capacitor is to charge to at least 87% of its final volt- age in no more than 8.0 s?

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