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?
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Final charge distribution on plate
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The electrostatic potential $V$ at a point on the circumference of a thin non-conducting disk of radius $r$ and uniform charge density $\sigma$ is given by equation $V = 4 \sigma r$. Which of the following expression correctly represents electrostatic energy stored in the electric field of a similar charged disk of radius $R$?
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