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An RLC circuit, with R = 12 Ω, L = 1 H, C = 0.01 f,...

An RLC circuit, with R = 12 Ω, L = 1 H, C = 0.01 f, connects to a 20 V source. If the switch is initially off and turns on after 10 seconds, staying on for 20 seconds , to then be permanently disconnected, also at the beginning consider that the capacitor is discharged and that the current is zero. Determine:
a) The accumulated charge on the capacitor for t = 8sec
b) The accumulated charge in the capacitor for t = 15sec

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