Chapter 18: Q11CQ (page 661)
Given the polar character of water molecules, explain how ions in the air form nucleation centers for rain droplets.
Ions in the air attract polar molecules like water as it has a partial positive charge in Hydrogen atoms and a partial negative charge on Oxygen atom.
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(a) Find the total electric field at\(x = 1.00{\rm{ cm}}\)in Figure 18.52(b) given that\(q = {\rm{5}}{\rm{.00 nC}}\). (b) Find the total electric field at\(x = {\rm{11}}{\rm{.00 cm}}\)in Figure 18.52(b). (c) If the charges are allowed to move and eventually be brought to rest by friction, what will the final charge configuration be? (That is, will there be a single charge, double charge, etc., and what will its value(s) be?)
Figure 18.52 (a) Point charges located at \({\bf{3}}.{\bf{00}},{\rm{ }}{\bf{8}}.{\bf{00}},{\rm{ }}{\bf{and}}{\rm{ }}{\bf{11}}.{\bf{0}}{\rm{ }}{\bf{cm}}\) along the x-axis. (b) Point charges located at \({\bf{1}}.{\bf{00}},{\rm{ }}{\bf{5}}.{\bf{00}},{\rm{ }}{\bf{8}}.{\bf{00}},{\rm{ }}{\bf{and}}{\rm{ }}{\bf{14}}.{\bf{0}}{\rm{ }}{\bf{cm}}\) along the x-axis
An electron has an initial velocity of\(5.00 \times {10^6}{\rm{ m}}/{\rm{s}}\)in a uniform\(2.00 \times {10^5}{\rm{ N}}/{\rm{C}}\)strength electric field. The field accelerates the electron in the direction opposite to its initial velocity. (a) What is the direction of the electric field? (b) How far does the electron travel before coming to rest? (c) How long does it take the electron to come to rest? (d) What is the electron’s velocity when it returns to its starting point?
Compare and contrast the Coulomb force field and the electric field. To do this, make a list of five properties for the Coulomb force field analogous to the five properties listed for electric field lines. Compare each item in your list of Coulomb force field properties with those of the electric field—are they the same or different? (For example, electric field lines cannot cross. Is the same true for Coulomb field lines?)
Figure 18.47 shows the electric field lines near two charges q1 and q2. What is the ratio of their magnitudes? (b) Sketch the electric field lines a long distance from the charges shown in the figure.
Figure 18.47 The electric field near two charges
When a glass rod is rubbed with silk, it becomes positive and the silk becomes negative—yet both attract dust. Does the dust have a third type of charge that is attracted to both positive and negative? Explain.
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