Doing The Electric Dance

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

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