Compute each part of given question:
Question: Two 2.00cm diameter insulating spheres have a distance of 5.50cm between their surfaces. The spheres each have a uniform volume charge distribution with one sphere charged to +67.6nC and the other charged to -85.3nC.
Part I: What is the charge density of the +67.6nC sphere?
Part II: What is the electric field strength at the midpoint between the two spheres?
Explain your answers please for best answer!