In the figure shown the plates of a parallel plate capacitor have unequal charges. Its capacitance is '$C$'. $P$ is a point outside the capacitor and close to the plate of charge-$Q$. The distance between the plates is '$d$' then which statement is wrong

 

$N$ identical capacitors are joined in parallel and the combination is charged to a potential $V$. Now if they are separated and then joined in series then the energy of combination will

Two parallel plate capacitors whose capacities are$C$ and $2C$ respectively, are joined in parallel. These are charged by $V$ potential difference. If the battery is now removed and a dielectric of dielectric constant $K$ is filled in between the plates of the capacitor $C$, then, what will be the potential difference across each capacitor?