The diagrams show two uniformly charged spheres The charge o

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?

Solution

It will be fourth. Since the electric field at distance R which is greater than radius = k Q/R^2 for uniform sphere it is directly proportion to Q.