Positive charge Q is distributed uniformly over each of two spherical volumes with radius R. One sphere

Question:

Positive charge Q is distributed uniformly over each of two spherical volumes with radius R. One sphere of charge is centered at the origin and the other at x = 2R (Fig. 22.44). Find the magnitude and direction of the net electric field due to these two distributions of charge at the following points on the x-axis:
(a) x = 0;
(b) x = R/2;
(c) x = R;
(d) x = 3R.

R R R