If capacitor connected across $AB$ is charged to $Q$ and then switch is shifted to $2$ . The heat released after that
Diffcult
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$\mathrm{U}_{\mathrm{i}}=\frac{\mathrm{Q}^{2}}{2 \mathrm{C}} \quad \mathrm{U}_{\mathrm{f}}=\frac{\mathrm{Q}^{2}}{6 \mathrm{C}}$
Heat $\mathrm{U}_{\mathrm{i}}-\mathrm{U}_{\mathrm{f}}$
$=\frac{Q^{2}}{3 C}$
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