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Chapter 18: Q8CQ (page 661)
What is grounding? What effect does it have on a charged conductor? On a charged insulator?
When a charged body is connected to the ground it becomes neutral.
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Sketch the electric field lines in the vicinity of the conductor in Figure 18.49 given the field was originally uniform and parallel to the object’s long axis. Is the resulting field small near the long side of the object?
Figure 18.49
(a) Find the total Coulomb force on a charge of \(2.00{\rm{ nC}}\) located at \(x = 4.00{\rm{ cm}}\) in Figure 18.52 (b), given that \(q = 1.00{\rm{ \mu C}}\). (b) Find the \({\rm{x}}\)-position at which the electric field is zero in Figure 18.52 (b).
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) By what factor must you change the distance between two-point charges to change the force between them by a factor of \(10\)? (b) Explain how the distance can either increase or decrease by this factor and still cause a factor of \(10\) change in the force.
(a) Sketch the electric field lines near a point charge +q (b) Do the same for a point charge -3.00q.
What is the repulsive force between two pith balls that are 8.00cm apart and have equal charges of -30.0 nC ?
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