Conisder a system of three charges `q//3`, `q//3` and `-2q//3` placed at point A, B and C, respectively, as shown in the figure. Take O to be centre of the circle of radius R and angle `CAB=60^@`

Options

A. The electric field at point O is `q/(8pi epsi_(0) R^(2))` directed along the nagative x-axis.
B. The potential energy of the system is zero.
C. The magnitude of the force between the charge at C and B is `q^(2)/(54pi epsi_(0) R^(2))`.
D. The potential at point O is `q/(12 pi epsi_(0) R)`.

Answer

C