Electric potential of charged particles

Electricity and Magnetism Level 2

The two red points in the above diagram are charged particles A and B fixed on the \(x\)-axis. The blue curves represent the electric potentials generated by A and B as a function of the position on the \(x\)-axis. Which of the following statements is correct?

a) Particles A and B have the same sort of charges.
b) The direction of the electric field at point O is \(-x\) direction.
c) The quantity of the electric charge of particle A is greater than that of particle B.


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