Two condensers of capacity `C` and `2C` are connected in parallel and these are charged upto `V` volt. If the battery is removed and dielectric medium of constant `K` is put between the plates of first condenser, then the potential at each condenser is.

Options

A. `(3V)/(K+2)`
B. `(3V)/(K)`
C. `(V)/(K+2)`
D. `(V)/(K)`

Answer

A

Explanation

Since total charge remains same
`2CV+CV=2CV+KCV'`
`V'=(3V)/(K+2)`