Question

A parallel plate capacitor is charged and then disconnected from the charging battery. If the plates are now moved farther apart by pulling at them by means of insulating handles, then

• A. the energy stored in the capacitor decreases
• B. the capacitance of the capacitor increases
• C. the charge on the capacitor decreases
• D. the voltage across the capacitor increases

Answer 1

Answer: (D)

We know that
The parallel plate capacitor $C=\frac{\varepsilon_{0} \cdot A}{d}$
When $d$ (distance between two parallel plate) increase, then $C$ will be decrease
$\because Q=C V $ where $Q=$ constant
$\therefore $ The voltage across the capacitor increases.