Consider a spherical shell of radius R with a total charge `+Q` uniformly spread on its surface (center of the shell lies at the origin x= 0). Two point charge, `+q` and `-q` are brought, one after the other, from far away and placed at `x = -a//2` and `x = + a//2 (a lt R)`, respectively. Magnitude of the work done in this process is

Options

A. `(Q+q)^(2)//4pi epsilon_(0)a`
B. zero
C. `q^(2)//4pi epsilon_(0) a`
D. `Qq//4pi epsilon_(0)a`

Answer

C