Transferring electric charge

Three identical conducting spheres are located at the vertices of an equilateral triangle ABC. Initially the charge the charge of the sphere at point A is \(q_{A}=0\) and the spheres at B and C carry the same charge \( q_{B}=q_{C}=q.\) It is known that the sphere B exerts an electrostatic force on C which has a magnitude \(F=4~\mbox{N}.\) Suppose an engineer connects a very thin conducting wire between spheres A and B. Then she removes the wire and connects it between spheres A and C. After these operations, what is the magnitude of the force of interaction in Newtons between B and C?

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