A charged capacitor is discharged through a resistor. The current I (t) through this resistor, determined by measuring the voltage V R (t) = I (t) R with an oscilloscope, is shown in the graph. The total energy dissipated in the resistor is 2.0 × 10ˆ’4 J.
(a) Find the capacitance C, the resistance R, and the initial charge on the capacitor.
(b) At what time is the stored energy in the capacitor 5.0 × 10ˆ’5 J?

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100 80 60 40 20 0 2 4 68 10 t (ms)