In the circuit shown the cells are ideal and of equal emfs, the capacitance of the capacitor is $C$ and the resistance of the resistor is $R. X$ is first joined to $Y$ and then to $Z$. After a long time, the total heat produced in the resistor will be
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Word done by cell $=2 q . V$

$=4\left(\frac{1}{2} q \cdot V\right)$

$=4$ (energy stored in capacitor)

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