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IIT JEE Advanced 2008 Paper 2

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Question : 8

Total: 66

Consider a system of three charges q/3, q/3 and –2q/3 at points A, B and C respectively, as shown in the figure below. Take O to be the centre of the circle of radius R and angle CAB = 60°. Which among the following is correct?

The electric field at point O is q∕(8πε0R2) directed along the negative x-axis.
The potential energy of the system is zero.
The magnitude of the force between the charges at C and B is q2∕(54πε0R2).
The potential at point O is q∕(12πε0R2).

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