Goal: Reasoning with electric fields.
The diagrams show two uniformly charged spheres. The charge on the
right sphere is three times as large as the charge on the left sphere.
Each vector represents the electric field at the center of one sphere
caused by the other sphere. Which choice best represents the
magnitude and direction of the electric field vectors caused by one
sphere at the position of the other sphere?
(5) The electric field at the sphere with smaller charge is three times
larger than the field at the sphere with larger charge.