# Physics homework. Help is greatly appreciated?

If the electrical force of repulsion between two 1mC charges is 10 N, how far apart are they?

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- 10 months agoFavorite Answer
F = k * C[1] * C[2] / r^2

https://en.wikipedia.org/wiki/Coulomb%27s_law

k = 9 * 10^(9) N * m^2 / C^2

C[1] = 1 * 10^(-3) C

C[2] = 1 * 10^(-3) C

10 = 9 * 10^(9) * 10^(-3) * 10^(-3) / r^2

r^2 = 9 * 10^(9 - 6) / 10

r^2 = 9 * 10^(3 - 1)

r^2 = 9 * 10^(2)

r = 3 * 10

r = 30

30 meters

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