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Serway_CP_poll_ch15 - Doug rubs a piece of fur on a hard...

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Doug rubs a piece of fur on a hard rubber rod, giving the rod a negative charge. What happens? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. protons are removed from the rod 2. electrons are added to the rod 3. the fur is also charged negatively 4. the fur is left neutral
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Two point charges are 4 cm apart. They are moved to a new separation of 2 cm. By what factor does the resulting mutual force between them change? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 1/2 2. 2 3. 1/4 4. 4
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Relative distribution of charge density on the surface of a conducting solid depends on: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. the shape of the conductor 2. mass density of the conductor 3. type of metal of which the conductor is made 4. strength of the earth's gravitational field
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An uncharged conductor is supported by an insulating stand. I pass a positively charged rod near the left end of the conductor, but do not touch it. The right end of the conductor will be: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. negative 2. positive 3. neutral 4. attracted
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The electric field at the surface of a positively charged conductor has a direction characterized by which of the following? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. tangent to the surface 2. perpendicular inward toward the charge 3. at a 45° angle to the surface 4. perpendicular outward and away from the charge
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Two point charges each have a value of 30 mC and are separated by a distance of 4.0 cm. What is the electric field at a point midway between the two charges? ( k = 9 x 10 9 SI unit) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 40.5 x 10 7 N/C 2. 20.3 x 10 7 N/C 3. 10.1 x 10 7 N/C 4. zero
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Two point charges are separated by 10 cm and have I charges of +2.0 and -2.0 mC, respectively. What is the electric field at a point midway between the two charges? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. 28.8 x 10 6 N/C 2. 14.4 x 10 6 N/C 3. 7.2 x 10 6 N/C 4. zero
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The number of electric field lines passing through a unit cross sectional area is indicative of: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. field direction 2. charge density 3. field strength 4. charge motion
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Of the following substances, which one contains the highest density of free electrons? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 1. hard rubber 2. iron 3. amber 4. glass
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Which of the following best characterizes electrical conductors?
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