The capacitor $C$ is initially without charge.$X$ is now j oined to $Y$ for a long time, during which $H_1$ heat is produced in the resistance $R$. $X-Y$ connection is removed and $X$ is now joined to $Z$ for a long time, during which heat $H_2$ is produced in $R$.
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Initially when $X$ is joined with $Y$ energy stored in capacitor $=$ heat proeduced $R- H_2$
When $X$ is jojned with $Z$ energy store $d$ capacitor will be lost as heat in $R$.
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