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Plates $A$ and $B$ constitute an isolated, charge parallel-plate capacitor. The inner surfaces ($I$ and $IV$) of $A$ and $B$ have charges $+Q$ and $-Q$ respectively. Athird plate $C$ with charge $+$$Q$ is now introduced midway between $A$ and $B$. Which of the following statements is not correct?

• A
  The surfaces $I$ and $II$ will have equal and opposite charges.
• B
  The surfaces $III$ and $IV$ will have equal and opposite charges.
• C
  the charge on surface $III$ will be greater than $Q$.
• ✓
  The potential difference between $A$ and $C$ will be equal to the potential difference between $C$ and $B$.