A capacitor is charged by a 9.0-V battery. The charging current I (t) is shown.
(a) What, approximately, is the total charge on the capacitor in the end?
(b) Using your answer to (a), find the capacitance C of the capacitor.
(c) Find the total resistance R in the circuit.
(d) At what time is the stored energy in the capacitor half of its maximum value?

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80 60 40 20 0 50 100 150 200 250 t (ms)