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| 1. |
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//8piepsilon_0R^2` directed along the negative x-axis.B. the potential energy of the system is zeroC. the magnitude of the force between the charges at C and B is `q^2// 54 piepsilon_0R^2`.D. the potential at point O is `q //12piepsilon_0R` |
| Answer» `F_(BC)=(1)/(4piepsilon_(0))(((q)/(3))((2q)/(3)))/((R//sqrt(3))^(2))=(q^(2))/(54piepsilon_(0)R^(2))` | |