Ch 22 Relevant Concept Questions

Ch 22 Relevant Concept Questions - ion? How is your answer...

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University Physics Young and Freedman Chapter 22 Concept Questions and solutions Chapter 22: Pre-chapter Question Q: If the child stands inside a large, charged metal sphere, will her hair stand on end? A: No. Inside of a conductor, the electric field is 0. 1. If all of the dimensions of the box in Fig. 22.2a are increased by a factor of 3, what effect will this change have on the electric flux through the box? A: None. 2. To generate the maximum amount of electrical power, solar panels are installed so that they are as nearly face-on to the sun as possible. Explain how this orientation is analogous to maximizing the electric flux through a plane surface. A: The more parallel it becomes to the sun's rays, the less “ray flux” goes through the panels. Flux is defined by |E||A|cos(phi). When phi = 0, flux is maximized (cos(0) = 1). 3. What is the total electric flux through a surface that completely encloses a negative Li
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Unformatted text preview: ion? How is your answer affected if the surface is made larger, but still encloses the ion (and no other charge)? A: The Li anion has a charge equal to that of an electron (-1.6x10^-19 C). So flux is defined by (-1.6x10^-19 C)/(8.85x10^-12 (C^2)/Nm^2) = -1.81x10^-8 N(m^2)/C). 4. You place an amount of charge Q on the irregularly shaped conductor shown in Fig. 22.17. If you know the size and shape of the conductor, can you use Gauss' law to calculate the electric field at an arbitrary position outside the conductor? A: No; Gauss' law only works for highly symmetrical shapes and charge distribution. 5. Sensitive computer components are sometimes shipped in electrically conductive containers. How does this practice protect the components? A: Conducting boxes protect the components from strong electric fields that might exceed the limits of the flow of charge and damage them....
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