Question
A parallel plate capacitor is charged and then disconnected from the source of potential difference. If the plates of the condenser are then moved farther apart by the use of insulated handle, which one of the following is true?
✓
Answer
$Q=C V$ where $C=\frac{\epsilon_{0} A}{d}$ and $V=E d$
if $d$ increases then $C$ will decrease.
Hence option $C$ is wrong.
$V$ will increase because $E$ remains same.
Hence option $D$ is correct.
$Q=\frac{\epsilon_{0} A}{d} \times E d$ thus $Q$ will not depend on $d$ Hence option $A$ and $B$ are wrong.
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