In the circuit shown, find heat dissipated in the circuit after switch is opened (Initially switch is closed):

Initially switch is closed,
Charges on each capacitor are:
 
 
On opening switch  Let  charge flown is q.
 
Applying KVL:  $+\frac{(\frac{2CV}{3}+q)}{C}+\frac{(\frac{CV}{3}+q)}{C}-V=0$
$\Rightarrow q=0,$ No charge flow, 
So, no energy loss.