Physics for Scientists and Engineers 8ed - ch23 - end of chapter questions

Physics for Scientists and Engineers 8ed - ch23 - end of chapter questions

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Unformatted text preview: Questions W denotes answer available in Student Solutions Manual/Study Guide; O denotes objective question 1. Explain what is meant by the term “a neutral atom.” Explain what “a negatively charged atom” means. 2. O (i) A metallic coin is given a positive electric charge. Does its mass (a) increase measurably, (b) increase by an amount too small to measure directly, (c) remain unchanged, (d) decrease by an amount too small to measure directly, or (e) decrease measurably? (ii) Now the coin is given a negative electric charge. What happens to its mass? Choose from the same possibilities. 3. A student who grew up in a tropical country and is studying in the United States may have no experience with static electricity sparks and shocks until their first American winter. Explain. 4. Explain the similarities and differences between Newton’s law of universal gravitation and Coulomb’s law. 5. A balloon is negatively charged by rubbing, and then it clings to a wall. Does that mean the wall is positively charged? Why does the balloon eventually fall? 6. O In Figure 23.8, assume the objects with charges q 2 and q 3 are fixed. Notice that there is no sightline from the location of object 2 to the location of object 1. We could say that a bug standing on q 1 is unable to see q 2 because it is behind q 3 . How would you calculate the force exerted on the object with charge q 1 ? (a) Find only the force exerted by q 2 on charge q 1 . (b) Find only the force exerted by q 3 on charge q 1 . (c) Add the force that q 2 would exert by itself on charge q 1 to the force that q 3 would exert by itself on charge q 1 . (d) Add the force that q 3 would exert by itself to a certain fraction of the force that q 2 would exert by itself. (e) There is no definite way to find the force on charge q 1 . 7. O A charged particle is at the origin of coordinates. The particle produces an electric field of 4 ˆ i kN/C at the point with position vector 36 ˆ i cm. (i) At what location does the field have the value 1 ˆ i kN/C? (a) 9 ˆ i cm (b) 18 ˆ i cm (c) 72 ˆ i cm (d) 144 ˆ i cm (e) nowhere (ii) At what location is the value 16 ˆ i kN/C? Choose from the same possibilities. 8. Is it possible for an electric field to exist in empty space? Explain. Consider point A in Figure 23.21a. Does charge exist at this point? Does a force exist at this point? Does a field exist at this point? 9. O (i) Rank the magnitude of the forces charged particle A exerts on charged particle B, located at distance r away from A, from the largest to the smallest in the following cases. In your ranking, note any cases of equality. (a) q A = 20 nC, q B = 20 nC, r = 2 cm (b) q A = 30 nC, q B = 10 nC, r = 2 cm (c) q A = 10 nC, q B = 30 nC, r = 2 cm (d) q A = 30 nC, q B = 20 nC, r = 3 cm (e) q A = 45 nC, q B = 20 nC, r = 3 cm (ii) Rank the magnitudes of the electric fields charged particle A creates at the location of charged particle B, a distance r away from A, from the largest to the smallest in the same cases. In your ranking, note any smallest in the same cases....
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This note was uploaded on 05/22/2010 for the course PHYS 2326 taught by Professor Staff during the Summer '08 term at HCCS.

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Physics for Scientists and Engineers 8ed - ch23 - end of chapter questions

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