Two spherical conductors `A_(1)` and `A_(2)` of radii `r_(1)` and `r_(2)` are placed concentrically in air. The two are connected by a copper wire as shown in figure. Then, the equivalent capacitance of the system is

Options

A. `(4 pi in_(0)k r_(1)r_(2))/(r_(2)-r_(1))`
B. `4 pi in_(0)(r_(1)+r_(2))`
C. `4pi in_(0)r_(2)`
D. `4 pi in_(0)r_(1)`

Answer

C