Question

A parallel plate capacitor is charged by connecting its plates to the terminals of a battery. The battery is then disconnected and a glass plate is interposed between the plates of the capacitor, then

• A. The capacity increases while the potential difference decreases
• B. The capacity increases while the potential difference increases
• C. The capacity decreases while the potential difference increases
• D. capacity decreases while the potential difference decreases

Answer 1

The correct option is A

The capacity increases while the potential difference decreases

When the battery is disconnected, the charge in the condenser is conserved as it is isolated from the source. Due to insertion of the dielectric, the capacitance increases and hence the potential difference must decrease.