# Two charged particles

The above shows isoelectric lines generated by two charged particles $$q_1$$ and $$q_2$$ fixed on the $$x$$-axis of an $$xy$$-plane, where $$q_1$$ is a positively charged particle. The points $$A,$$ $$B$$ and $$C$$ are also on the $$x$$-axis with the distances from the origin being $$d,$$ $$3d$$ and $$5d,$$ respectively. The isoelectric line passing through the point $$B$$ is parallel to the $$y$$-axis, and the point $$D$$ is on this isoelectric line. Which of the following statements is NOT correct?

a) $$q_2$$ is a negatively charged particle.

b) The voltage at the point $$A$$ is higher than the voltage at the point $$B$$.

c) If we put a positive charge on the point $$B$$, then it does not move.

d) The direction of the electric field at the point $$A$$ is the same as that at the point $$C$$.

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