Chapter 18: Q1CQ (page 661)
There are very large numbers of charged particles in most objects. Why, then, don’t most objects exhibit static electricity?
To exhibit static electricity, the object must have some resultant charge (net charge) on it, which is impossible for a neutral object.
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(a) Find the electric field at the center of the triangular configuration of charges in Figure 18.54, given that\({q_a} = + {\rm{2}}{\rm{.50 nC}}\),\({q_b} = - {\rm{8}}{\rm{.00 nC}}\), and\({q_c} = + {\rm{1}}{\rm{.50 nC}}\). (b) Is there any combination of charges, other than\({q_a} = {q_b} = {q_c}\), that will produce a zero-strength electric field at the center of the triangular configuration?
Figure 18.54 Point charges located at the corners of an equilateral triangle\(25.0{\rm{ cm}}\)on a side.
(a) Find the ratio of the electrostatic to gravitational force between two electrons. (b) What is this ratio for two protons? (c) Why is the ratio different for electrons and protons?
At what distance is the electrostatic force between two protons equal to the weight of one proton?
Sketch the electric field lines in the vicinity of the charged insulator in Figure 18.51 noting its nonuniform charge distribution.
Figure 18.51
A\(5.00{\rm{ g}}\)charged insulating ball hangs on a\(30.0{\rm{ cm}}\)long string in a uniform horizontal electric field as shown in Figure 18.56. Given the charge on the ball is\(1.00{\rm{ }}\mu {\rm{C}}\), find the strength of the field.
Figure 18.56 A horizontal electric field causes the charged ball to hang at an angle of\(8.00^\circ \).
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