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Chapter 18: Q2CQ (page 661)
Why do most objects tend to contain nearly equal numbers of positive and negative charges?
Most objects tend to contain nearly equal numbers of positive and negative charges because nature works on the principle of energy minimization.
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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?
(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 simple and common technique for accelerating electrons is shown in Figure 18.55, where there is a uniform electric field between two plates. Electrons are released, usually from a hot filament, near the negative plate, and there is a small hole in the positive plate that allows the electrons to continue moving. (a) Calculate the acceleration of the electron if the field strength is\(2.50 \times {10^4}{\rm{ N/C}}\). (b) Explain why the electron will not be pulled back to the positive plate once it moves through the hole.
Figure 18.55 Parallel conducting plates with opposite charges on them create a relatively uniform electric field used to accelerate electrons to the right. Those that go through the hole can be used to make a TV or computer screen glow or to produce X-rays.
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?
If 1.80脳1020 electrons move through a pocket calculator during a full day鈥檚 operation, how many coulombs of charge moved through it?
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