An electrostatic dust precipitator that is installed in a factory smokestack includes a straight metal wire of length Z. = 0.8 m that is charged approximately uniformly with a total charge Q=0.5×107 C. A speck of coal dust (which is mostly carbon) is near the wire, far from both ends of the wire; the distance from the wire to the speck is d= 1.2 cm. Carbon has an atomic mass of 12 (6 protons and 6 neutrons in the nucleus). A careful measurement of the polarizability of a carbon atom gives the value a = 1.96 × 10-40 (C. m)/(N/C). aps as (a) Calculate the initial acceleration of the speck of coal dust, neglecting gravity. Your answer must be expressed in terms of Q. L, d. and a. You can use other quantities in your calculations, but your final result must not include them. It is convenient to use the "binomial expansion" that you may have learned in calculus, that (1+e) 1. Note that can be negative. (Enter the magnitude. Use the following as necessary: Q. L, d. a, co, and m for the mass of a carbon atom. Use the binomial expansion in your answer.) 1+neife am am am GW Q'a 1 Q'a 4xco ml'd 40¹a Axce ml'd 40%a 4xca ml d' Calculate the initial acceleration of the speck of coal dust, neglecting gravity. Don't put numbers into your calculation until the very end, but then show the numerical calculation that you carry out on your calculator. (Enter the magnitude) m/s? (b) If the speck of coal dust were initially nine times as far from the charged wire, how much smaller would be the initial acceleration of the speck?
An electrostatic dust precipitator that is installed in a factory smokestack includes a straight metal wire of length Z. = 0.8 m that is charged approximately uniformly with a total charge Q=0.5×107 C. A speck of coal dust (which is mostly carbon) is near the wire, far from both ends of the wire; the distance from the wire to the speck is d= 1.2 cm. Carbon has an atomic mass of 12 (6 protons and 6 neutrons in the nucleus). A careful measurement of the polarizability of a carbon atom gives the value a = 1.96 × 10-40 (C. m)/(N/C). aps as (a) Calculate the initial acceleration of the speck of coal dust, neglecting gravity. Your answer must be expressed in terms of Q. L, d. and a. You can use other quantities in your calculations, but your final result must not include them. It is convenient to use the "binomial expansion" that you may have learned in calculus, that (1+e) 1. Note that can be negative. (Enter the magnitude. Use the following as necessary: Q. L, d. a, co, and m for the mass of a carbon atom. Use the binomial expansion in your answer.) 1+neife am am am GW Q'a 1 Q'a 4xco ml'd 40¹a Axce ml'd 40%a 4xca ml d' Calculate the initial acceleration of the speck of coal dust, neglecting gravity. Don't put numbers into your calculation until the very end, but then show the numerical calculation that you carry out on your calculator. (Enter the magnitude) m/s? (b) If the speck of coal dust were initially nine times as far from the charged wire, how much smaller would be the initial acceleration of the speck?
Physics for Scientists and Engineers: Foundations and Connections
1st Edition
ISBN:9781133939146
Author:Katz, Debora M.
Publisher:Katz, Debora M.
Chapter23: Electric Forces
Section: Chapter Questions
Problem 35PQ: Two 25.0-g copper spheres are placed 75.0 cm apart. Each copper atom has 29 electrons, and the molar...
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Transcribed Image Text:An electrostatic dust precipitator that is installed in a factory smokestack includes a straight metal wire of length L = 0.8 m that is
charged approximately uniformly with a total charge Q=0.5x107 C. A speck of coal dust (which is mostly carbon) is near the wire,
far from both ends of the wire; the distance from the wire to the speck is d= 1.2 cm. Carbon has an atomic mass of 12 (6 protons and
6 neutrons in the nucleus). A careful measurement of the polarizability of a carbon atom gives the value a = 1.96 x 10-40 (C.
m)/(N/C).
(a) Calculate the initial acceleration of the speck of coal dust, neglecting gravity. Your answer must be expressed in terms of Q. L, d.
and a. You can use other quantities in your calculations, but your final result must not include them. It is convenient to use the
"binomial expansion" that you may have learned in calculus, that (1+ef 1+neife 1. Note that can be negative. (Enter the
magnitude. Use the following as necessary: Q. L, d. a, co, and m for the mass of a carbon atom. Use the binomial expansion in your
answer.)
a=
(IM
G
Aneo mt. d
Qa
4xcoml'd
40¹a
4xco ml'd
40¹a
4xca ml-d'
Calculate the initial acceleration of the speck of coal dust, neglecting gravity. Don't put numbers into your calculation until the very
end, but then show the numerical calculation that you carry out on your calculator. (Enter the magnitude.)
m/s²
(b) If the speck of coal dust were initially nine times as far from the charged wire, how much smaller would be the initial acceleration of
the speck?
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