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WM 1 - Problems - PROBLEMS P21-3 What is the magnitude of...

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WM 1 CHAPTER 21, QUESTIONS 9, 10, 18, 19 CHAPTER 21, PROBLEMS 3, 14, 33, 37 QUESTIONS : Q21-9) The form of Coulomb’s law is very similar to that for Newton’s law of universal gravitation. What are the differences between these two laws? Compare also gravitational mass and electric charge. Q21-10) We are not normally aware of the gravitational or electric force between two ordinary objects. What is the reason in each case? Give an example where we are aware of each one and why. Q21-18) Consider the electric field at the three points indicated by the letters A, B, and C in Fig. 21-45. First draw an arrow at each point indicating the direction of the net force that a positive charge would experience if placed at that point, then list the letters in order of decreasing field strength (strongest first). Q21-19) Why can electric field lines never cross?
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Unformatted text preview: PROBLEMS: P21-3) What is the magnitude of the electric force of attraction between an iron nucleus (q=+26e) and its innermost electron if the distance between them is 1.5 x 10-12 m? P21-14) At each corner of a square of side l there are point charges of magnitude Q, 2Q, 3Q, and 4Q (Fig. 21-49). Determine the force on each charge due to the other three charges. P21-33) Draw, approximately, the electric field lines emanating from a uniformly charged straight wire whose length l is not great. The spacing between lines near the wire should be somewhat less than l. [Hint: Also consider points very far from the wire.] P21-37) Use Coulomb’s law to determine the magnitude and direction of the electric field at points A and B in Fig. 21-52 due to the two positive charges (Q = 7.0 m C) shown. Is your result consistent with Fig. 21-33b?...
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