question_answer

Two parallel plate capacitors of capacitance C and 2C are connected in parallel and charged to a potential difference V. The battery is then disconnected, and the region between the plates of C is filled completely with a material of dielectric constant K. The common potential difference across the combination becomes

A) \[\frac{2V}{K+2}\]

B) \[\frac{V}{K+2}\]

C) \[\frac{3V}{K+3}\]

D) \[\frac{3V}{K+2}\]