A capacitor is composed of three parallel conducting plates. All three plates are of same area A. The first pair of plates are kept a distance `d_(1)` apart and the space between them is filled with a medium of a dielectric `epsilon_(1)`. The corresponding values for the second pair of plates are `d_(2)`. and `epsilon_(2)` respectively. What is the surface charge density on the middle plate?

Options

A. `epsilon_(0)V[(epsilon_(1))/(d_(1))+(epsilon_(2))/(d_(2))]`
B. `-epsilon_(0)V[(epsilon_(1))/(d_(1))+(epsilon_(2))/(d_(2))]`
C. `2epsilon_(2)V[(epsilon_(1))/(d_(1))+(epsilon_(2))/(d_(2))]`
D. `-2epsilon_(0)V[(epsilon_(1))/(d_(1))+(epsilon_(2))/(d_(2))]`

Answer

A