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The capacitor shown in figure has been c...

The capacitor shown in figure has been charged to a potential difference of `V` volt, so that it carries a charge `CV` with both the switches `S_1 and S_2` remaining open. Switch `S_1` is closed at `t = 0`. At `t= R_1C` switch `S_1` is opened and `S_2` is closed. Find the charge on the capacitor at `t= 2R-1C + R_2C`.

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