Condenser A has a capacity of 15µF when it is filled with a medium of dielectric constant 15. Another condenser B has a capcity 1 µF 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) 400V
(B) 800V
(C) 1200V
(D) 1600V
