Question

A parallel plate capacitor is charged and the charging battery is then disconnected. If the plates of the capacitor are moved further apart by means of insulating handles , then:

• A. the charge in the capacitor becomes zero
• B. the capacitance becomes infinite
• C. the charge in the capacitor increases
• D. the voltage across the plates increases

Answer 1

The correct option is D the voltage across the plates increases

When the charging battery is removed charge present on the capacitor remains constant. (Q - constant )
we know $C=\frac{{ϵ}_{0}A}{d}$
As d increases, $C$decreases
We know $Q=CV$
$\therefore$ As $Q$ is constant and $C$ decreases voltage across the plates increases