The correct answer is 3.6N repulsive.
One of the fundamental forces of the cosmos is electrostatic force. The universe is governed by four fundamental forces. They are gravitational force, weak nuclear force, electromagnetic force, and strong nuclear force. Under electromagnetic force is the electrostatic force. Between two charges that are separated by a distance, there is an electrostatic force. The size of each charge and the separation between them determine the strength of the electrostatic force.
Given r=0.60m
F=10.8N
F=k q_1q_2/r^2=-10.8N_____(1)
q_1+q_2=-24_____(2)
solving 1 and 2
we get q_1, q_2
=12μC and -36μC
when joined with wire each sphere carries
q_1+q_2/2=-12μC
Electric force = kq_1q_2/r^2
=3.6N repulsive
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