![]() $ (a) What is the $R C$ time constant and the initial current out of the batteries while they are connected in parallel? (b) How long does it take for the capacitors to charge to $90 \%$ of the terminal voltages of the batteries? (c) What is the $R C$ time constant and the initial current of the capacitors connected in series assuming it discharges at $90\%$ of full charge? (d) How long does it take the current to decrease to $10 \%$ of the initial value? The capacitors discharge through a lamp with a resistance of $100 \Omega. $ The connections are then switched internally to place the capacitors in series. Consider a circuit that uses four AAA batteries connected in series to charge six $10-\mathrm$ capacitors through an equivalent resistance of $100 \Omega. ![]() They obtain a high voltage by charging capacitors in parallel and then internally changing the connections of the capacitors to place them in series. Some camera flashes use flash tubes that require a high voltage. ![]()
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