Problem: Two 2.00 cm diameter insulating spheres have a distance of 5.70 cm between their surfaces. The spheres each have a uniform volume charge distribution with one sphere charged to +73.6 nC and the other charged to -67.3 nC.
Part A: What is the electric field strength at the midpoint between the two spheres?
I need help to find the electric field strength at the midpoint between the two spheres.