A parallel plate air capacitor is charged to a potential difference of $V$. After disconnecting the battery, distance between the plates of the capacitor is increased using an insulating handle. As a result, the potential difference between the plates
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(b) $V = \frac{Q}{C}$ $=$ $\frac{{Qd}}{{{\varepsilon _0}KA}}$ $==>$ $V \propto d$
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