What must be the distance between point charge q1 # static

Chapter , Problem 3

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What must be the distance between point charge q1 # static force between A and B at the end of experiment 2 to that at the end of experiment 1? 9 Two identical conducting spheres, fixed in place, attract each other with an electrostatic force of 0.108 N when their center-to-center separation is 50.0 cm. The spheres are then connected by a thin conducting wire. When the wire is removed, the spheres repel each other with an electrostatic force of 0.0360 N. Of the initial charges on the spheres, with a positive net charge, what was (a) the negative charge on one of them and (b) the positive charge on the other? 10 In Fig. 21-25, four particles form a square.The charges are SSM WWW 26.0 mC and point charge q2 # $47.0 mC for the electrostatic force between them to have a magnitude of 5.70 N?