(c)When the spheres are close to each other, the excess negative charges on each sphere repel, as shown in Fig-ure 17.3c.Figure 17.3Reflect:We will learn later in the chapter that the excess charge on a conductor is on the surface of the conductor.17.4.Set Up:Unlike charges attract and in a conductor the excess charge is free to move.Solve:Negative charge in the earth is pulled to the surface beneath the charged cloud, as sketched in Figure 17.4.Figure 17.417.5.Set Up:The charge of one electron is Solve: (a)(b)17.6.Set Up:The total charge is the number if ions times the charge of each. Solve:17.7.Set Up:Charge conservation requires that the total charge Qof the reactants equals the total charge of theproducts. and has charge and each have charge Solve: (a)reactants:products Could not occur.(b)reactants:products Could occur.(c)reactants:products Could not occur.(d)reactants:products Could not occur.(e)reactants:products Could occur.
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