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## Homework Statement

Two identical conducting spheres, with a radius of 15.0 cm, are separated by a distance of 10 m. What is the charge in each sphere, if the potential of one sphere is +1500 V, and the potential of the other one is -1500 V? Which assumptions did you make?

## Homework Equations

Potential at the surface of a conductor with charge q and radius R:

[tex]V = \frac{q}{4\pi\epsilon_0R}[/tex]

## The Attempt at a Solution

If there was only one sphere at a potential of 1500 V, its charge would be:

[tex]q = 4\pi\epsilon_0RV = 4\pi(8.85\times 10^{-12})(0.15)(1500)=2.5\times 10^{-8} C[/tex]

But I don't know how to account for the fact that there are two spheres. Also, to what exactly is it referring by saying that each sphere is at a particular potential? Is it the potential due to the whole system?

Thank you in advance.