Aparallel-plate capacitor is connected to a cell. Its positive plate $A$ and its negative plate $B $ have charges $+Q$ and $-Q$ respectively. A third plate $C$, identical to $A$ and $B$, with charge $+Q$, is now introduced midway between $ A$ and $B$, parallel to them. Which of the following are correct?
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Now the charge on outer surfaces should be same
$q=Q-q \Rightarrow q=Q / 2$
So $(A)=-2 Q+Q / 2=-3 Q / 2$
Charge on $\mathrm{A}=\mathrm{Q} / 2$ and charge on $\mathrm{B}=3 \mathrm{Q} / 2$
So as $E \propto Q$ and $V \propto E \Rightarrow V \propto Q$
and hence $C$ is correct.
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