The spheres are brought into contact and then separated to a

The spheres are brought into contact and then separated to a distance of 2.80 cm. Determine the magnitude of the force that each sphere now experiences, and state whether the force is attractive or repulsive.
The values of the spheres are -20 micro coulombs and +40 coulombs

F = K(q1)(q2)/r^2 after contact q1 = q2 = (40-20)/2 = 10 k = 9 (10^9) r = 2.8(10^-2) so F = 1147.95 N