An electronic flash attachment for a camera produces the flash by using the energy stored in...

Question:

An electronic flash attachment for a camera produces the flash by using the energy stored in a 750 capacitor. If a 9V battery is used and the circuit has a 4000 ohm resistance, (a) find the time constant (how long does it take the flash to charge to 63% of its final value), (b) what initial current flows when the battery is connected? (c) how long does it take to charge the capacitor if I is constant?

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