Two spheres with uniform surface charge density, first with a radius of 7.2 cm and the second with a radius of 5.0 cm, are separated by a center-to-center distance of 33cm. The spheres have a combined charge of + 55uC and repel one another with a force of 0.75 N. Assume q1>q2.
What is the surface charge density on the first sphere?
What is the surface charge density on the second sphere?