Question

A parallel plate capacitor having air as dielectric medium is charged by a potential difference of V volt. After disconnecting the battery, the distance between the plates of the capacitor is increased using an insulated handle. As a result, potential difference between the plates

• A. Increases
• B. Does not change
• C. Becomes zero
• D. Decreases

Answer 1

Answer: (A)

Increases

When the battery is disconnected, the charge will remain same in any case. Capacitance of a parallel plate capacitor is given by

C=ε0A/d

When d is increased, capacitance will decreases and because the charge remains the same, so according to

q=CV,

the voltage will increase,