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Two identical conducting small spheres a...

Two identical conducting small spheres are placed with their centers 0.3 m aparts. One is given a charge of 12.0 nC and the other a charge of `-18.0 nC`.
(a) Find the electric force exerted by one sphere on the other?
(b) If the spheres are connected by a conducting wire, find the electric force between the two after they attain equilibrium.

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