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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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Tollbooth stations on roadways and bridges usually have a piece of wire stuck in the pavement before them that will touch a car as it approaches. Why is this done?
Two point charges exert a 5.00 N force on each other. What will the force become if the distance between them is increased by a factor of three?
(a) Find the electric field at\(x = 5.00{\rm{ cm}}\)in Figure 18.52 (a), given that\(q = 1.00{\rm{ }}\mu C\). (b) At what position between\(3.00\)and\(8.00{\rm{ cm}}\)is the total electric field the same as that for\( - 2q\)alone? (c) Can the electric field be zero anywhere between\(0.00\)and\(8.00{\rm{ cm}}\)? (d) At very large positive or negative values of\(x\), the electric field approaches zero in both (a) and (b). In which does it most rapidly approach zero and why? (e) At what position to the right of\(11.0{\rm{ cm}}\)is the total electric field zero, other than at infinity? (Hint: A graphing calculator can yield considerable insight in this problem.)
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
A certain lightning bolt moves 40.0 C of charge. How many fundamental units of charge is this?
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鈥檚 velocity when it returns to its starting point?
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