Question

1. Two charged objects in a laboratory are brought to a distance of 75 centimeters away from each other. If the force between the spheres is 6,250 N and the charge on one object is 9.9 x 10^-3 C, what is the charge on the other object?

Answer 1

$q_2=\frac{Fr^2}{kq_1}=39.5~\mu C.$