PHY 2049 Study Guide - Midterm Guide: Atomic Number, Molar Mass, Lightning
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X and y are two uncharged metal spheres on insulating stands and are in contact with each other. A positively charged rod r is brought close to x as shown in figure (a). Sphere y is now moved away from x, as in figure (b). Answer: x is negative, and y is positive. Two identical small charged spheres are a certain distance apart, and each one initially experiences an electrostatic force of magnitude f due to the other. With time, charge gradually leaks off of both spheres. When each of the spheres has lost half its initial charge, the magnitude of the electrostatic force will be. When two point charges are a distance d part, the electric force that each one feels from the other has magnitude f. in order to make this force twice as strong, the distance would have to be changed to.