(Solved): Two uncharged metal spheres, #1 and #2, are mounted on insulating support rods. A third metal sphere ...

Two uncharged metal spheres, #1 and #2, are mounted on insulating support rods. A third metal sphere, carrying a positive charge, is then placed near 12 . Now a copper wire is momentarily connected between #1 and #2 and then removed. Finally, sphere #3 is removed. In this final state spheres 81 and 82 are still uncharged. sphere 71 carrles positive charge and 72 carries negative charge. sphere #1 carries negative charge and #2 carries positive charge. spheres 81 and 82 both carry positive charge. spheres

and

both carry negative charge.