Condenser `A` has a capacity of `15 muF` when it is filled with a medium of dielectric constant `15`. Another condenser `B` has a capacity `1muF` with air between the plates. Both are charged separately by a battery of `100V`. After charging, both are connected in parallel without the battery and the dielectric material being removed. The common potential now is
A. 400 V
B. 800 V
C. 1200 V
D. 1600 V
