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Unformatted text preview: HW2 : CHAPTER 21, QUESTIONS 6, 14, 15, 17 CHAPTER 22, QUESTIONS 11 CHAPTER 21, PROBLEM 11 CHAPTER 22, PROBLEMS 1, 4, 13, 15 QUESTIONS : Q21-6) Contrast the net charge on a conductor to the free charges. Q21-14) Explain why we use small test charges when measuring electric fields. Q21-15) When determining an electric field, must we use a positive test charge, or would a negative one do as well? Explain. Q21-17) Assume that the two opposite charges in Fig. 21-33a are 12.0 cm apart. Consider the magnitude of the electric field 2.5 cm from the positive charge. On which side of this charge top, bottom, left, or right is the electric field the strongest? The weakest? Q22-11) A point charge Q is surrounded by a spherical surface of radius r0, whose center is at Q. Later, the charge is moved to the right a distance ½ r0, but the sphere remains where it was, Fig. 22-22. How is the electric flux F E through the sphere changed? Is the electric field at the surface of the sphere changed? For each sphere changed?...
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