Two equally charged, identical metal spheres A and B repel each other with a force 'F. The spheres are kept fixed with a distance 'r' between them. A third identical, but unchargedsphere C is brought in contact with A and then placed at the mid-point of the line joining A and B. The magnitude of the net electric force on C is(a) F(c) F/2(b) 3F/4(d) F/4

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