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Conisder a system of three charges q//3,...

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^@`

A

The electric field at point O is `q/(8pi in_0R^2)` directed along the negative x-axis.

B

The potential energy of the system is zero

C

The magnitude of the force between the charges at C and B is `q^2/(54pi in_0R^2)`

D

The potential at point O is `q/(12pi in_0R^2)`

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