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Chapter 18: Q6CQ (page 661)
Why does a car always attract dust right after it is polished? (Note that car wax and car tires are insulators.)
Static electricity is responsible for the attraction of dust particles toward the car.
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Are the direction and magnitude of the Coulomb force unique at a given point in space? What about the electric field?
What is the repulsive force between two pith balls that are 8.00cm apart and have equal charges of -30.0 nC ?
The classic Millikan oil drop experiment was the first to obtain an accurate measurement of the charge on an electron. In it, oil drops were suspended against the gravitational force by a vertical electric field. (See Figure 18.58.) Given the oil drop to be\(1.00{\rm{ }}\mu {\rm{m}}\)in radius and have a density of\(920{\rm{ kg}}/{{\rm{m}}^3}\): (a) Find the weight of the drop. (b) If the drop has a single excess electron, find the electric field strength needed to balance its weight.
Figure 18.58 In the Millikan oil drop experiment, small drops can be suspended in an electric field by the force exerted on a single excess electron. Classically, this experiment was used to determine the electron charge\({q_e}\)by measuring the electric field and mass of the drop.
Figure 18.43 shows the charge distribution in a water molecule, which is called a polar molecule because it has an inherent separation of charge. Given water鈥檚 polar character, explain what effect humidity has on removing excess charge from objects.
Figure 18.43 Schematic representation of the outer electron cloud of a neutral water molecule. The electrons spend more time near the oxygen than the hydrogens, giving a permanent charge separation as shown. Water is thus a polar molecule. It is more easily affected by electrostatic forces than molecules with uniform charge distributions.
Why is a golfer with a metal club over her shoulder vulnerable to lightning in an open fairway? Would she be any safer under a tree?
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