any same length uncharge objects different charged objects repelled point-like attached angle torsion balance Charles Coulomb determined the dependence of the force between separation. The experimental apparatus he used is called a(an) Coulomb hung a light glass rod from a thin wire. At the ends of the rod he metal spheres. He then charged a third metal sphere and touched one of the spheres the rod. on the distance of The two spheres consequently had the electric charge, and they wire twisted until the torque exerted by the wire on the glass rod balanced the torque exerted by one charged sphere on the other. The Coulomb's expression is used for identical small objects. The Coulomb measured the of this twist and used it to determine the electric force exerted by one sphere on the other. He measured the distance between the repelling spheres and varied it to see how the force of repulsion depended on the distance between them. to

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