Two square plates of side 'a' are arranged as shown in the figure. The minimum separation between plates is 'd' and one of the plate is inclined at small angle `alpha` with plane parallel to another plate. The capacitance of capacitor is (given `alpha` is very small)

Options

A. `(in_(0)a^(2))/(d)(1-(alphaa)/(d))`
B. `(in_(0)a^(2))/(d)(1-(alphaa)/(4d))`
C. `(in_(0)a^(2))/(d)(1+(alphaa)/(2d))`
D. `(in_(0)a^(2))/(d)(1-(3alphaa)/(2d))`

Answer

A