Three charge `-q,+q` and `-q` are placed at the corners of an equilateral triangle of side `a` The resultant electric force an a charge `+q` placed at a the centroid `O` of the triangle is

Options

A. `(3q^(2))/(4pi epsilon_(0)a^(2))`
B. `(q^(2))/(4pi epsilon_(0)a^(2))`
C. `(q^(2))/(2piepsilon_(0)a^(2))`
D. `(3q^(2))/(2pi epsilon_(0)a^(2))`

Answer

D

Explanation

`F=1/(4pi epsilon_(0)) (q_(1)q_(2))/(r^(2))`