# Point charges in plane

As shown above, two point charges $$A$$ and $$B$$ are fixed on the $$x$$-axis with an equal distance of $$d$$ from the origin $$O.$$ $$A$$ is charged negatively, while $$B$$ is charged positively. The quantities of the electric charges on $$A$$ and $$B$$ are the same. The distances between the origin $$O$$ and the two points $$P$$ and $$Q$$ on the $$y$$-axis are also the same, which is $$d.$$ Which of the following is correct?

a) The electric field intensities at $$P$$ and $$Q$$ are the same.

b) The direction of the electric field at $$O$$ is the $$-x$$ direction.

c) If we move the point charge $$A$$ to $$O$$, then the directions of the electric fields at $$P$$ and $$Q$$ are the same.

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