Physics Electrostatic?

Two spheres separated by a distance d. Each carry charges of +120 μC each. If the force between them is 0.145 N, then what is the distance between them?

oubaas2021-03-21T09:29:03Z

F =  k*Q^2/d^2
d = Q√k/F = 1.2*10^-4*√9.0*10^9/0.145 = 0.41 m 

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