As shown above, two point charges and are fixed on the -axis with an equal distance of from the origin is charged negatively, while is charged positively. The quantities of the electric charges on and are the same. The distances between the origin and the two points and on the -axis are also the same, which is Which of the following is correct?
a) The electric field intensities at and are the same.
b) The direction of the electric field at is the direction.
c) If we move the point charge to , then the directions of the electric fields at and are the same.