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Q.
The capacitance $C$ of a capacitor is
J & K CETJ & K CET 2008Electrostatic Potential and Capacitance
Solution:
By definition, Charge(Q) acquired by the plates of a capacitor is proportional to the potential difference $(V)$ applied to it.
$
\begin{array}{l}
\text { i.e. } \quad Q \propto V \\
\Rightarrow \quad Q = CV ,
\end{array}
$
Where $C$ is the constant of proportionality called capacitance of the capacitor.
The capacitance $( C )$ of a capacitor depends on its geometrical configuration(i.e. size and shape) of the capacitor and on the dielectric medium inside it.
e,g, Capacitance of a parallel plated capacitor, $C =\frac{ K \epsilon_{0} A }{ d }$
Therefore, On changing Potential difference, the charge on the capacitor changes proportionately and vice versa. But capacitance does not change, as it is the constant of proportionality.