What was the initial negative charge on one of the sphere

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Q. Two identical conducting spheres, fixed in place, attract each other with the force of 0.112 N when their center to center separation is 43 cm. The spheres are then connected by a thin conducting wire. When the wire is removed, the spheres have a net positive charge and repel each other with an electrostatic force of 0.04 N. What was the initial negative charge on one of the spheres, and what was the initial positive charge on the other? (Hint: Use charge conservation and solve for one of the initial charges. You would end up with a quadratic equation. The solutions give you positive and negative charges.)

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