689_Physics ProblemsTechnical Physics

# 689_Physics ProblemsTechnical Physics - 24 Gausss Law...

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24 CHAPTER OUTLINE 24.1 Electric Flux 24.2 Gauss’s Law 24.3 Application of Gauss’s Law to Various Charge Distributions 24.4 Conductors in Electrostatic Equilibrium 24.5 Formal Derivation of Gauss‘s Law Gauss’s Law ANSWERS TO QUESTIONS Q24.1 The luminous flux on a given area is less when the sun is low in the sky, because the angle between the rays of the sun and the local area vector, d A , is greater than zero. The cosine of this angle is reduced. The decreased flux results, on the average, in colder weather. Q24.2 If the region is just a point, line, or plane, no. Consider two protons in otherwise empty space. The electric field is zero at the midpoint of the line joining the protons. If the field-free region is three-dimensional, then it can contain no charges, but it might be surrounded by electric charge. Consider the interior of a metal sphere carrying static charge. Q24.3 The surface must enclose a positive total charge.
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