Capacitor C is initially charged from a battery with e. d.s. E and disconnected from battery. Another (uncharged) capacitor of capacitance C1 is connected to it (Fig. 90, a). Then capacitor C1 is disconnected from C and reconnected, but in such a way that now the upper plate of capacitor C is connected to the lower plate of capacitor C1 (Fig. 90b). Determine the potential difference across capacitor C.

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