Three identical spheres each having a charge q and radius R, are kept in such a way that
each touches the other two spheares. The magnitude of the electric force on any sphere
due to other two is ...........
Options:
(a) `R/2 1/(4piepsilon_o)sqrt5/4(q/R)^2`
(b) `1/(8piepsilon_o)sqrt(2/3)(q/R)^2`
(c) ` 1/(4piepsilon_o)sqrt3/4(q/R)^2`
(d) `-1/(8piepsilon_o)sqrt(3/2)(q/R)^2`