Question: Two spheres with uniform surface charge density, one with a radius of 7.8 cm and the other with a radius of 4.1 cm, are separated

Two spheres with uniform surface charge density, one with a radius of 7.8 cm and the other with a radius of 4.1 cm, are separated by a center-to-center distance of 38 cm. The spheres have a combined charge of +55 µC and repel one another with a force of 0.75 N. What is the surface charge density on each sphere?

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