In the future people will only enjoy one sport: Electrodisc. In this sport you gain points when you cause metallic discs hovering on a field to exchange charge. You are an Electrodisc player playing the popular four disc variant. The disks have charges of qA = -8.0 μC, B = -2.0 μC, qc = +5.0 μC, and qp = +12.0 μC. (a) You bring two disks together and then separate them. You measure the resulting charge of these two disks and find that it is +5.0 µC per disk. Which two disks did you bring together? O A and B O A and C O A and D O B and C OB and D O C and D (b) You bring three disks together and then separate them. You measure the resulting charge of these three disks and find that it is +3.0 µC per disk. Which three disks did you bring together? O A, B, and C O A, B, and D O A, C, and D O B, and D (c) Given the resulting charge of each disk measured in (b) is +3.0 μC, how many electrons would you need to add to a disk of this charge to electrically neutralize it? electrons

In the future people will only enjoy one sport: Electrodisc. In this sport you gain points when you cause metallic discs hovering on a field to exchange charge. You are an Electrodisc player playing the popular four disc variant. The disks have charges of qA = -8.0 μC, B = -2.0 μC, qc = +5.0 μC, and qp = +12.0 μC. (a) You bring two disks together and then separate them. You measure the resulting charge of these two disks and find that it is +5.0 µC per disk. Which two disks did you bring together? O A and B O A and C O A and D O B and C OB and D O C and D (b) You bring three disks together and then separate them. You measure the resulting charge of these three disks and find that it is +3.0 µC per disk. Which three disks did you bring together? O A, B, and C O A, B, and D O A, C, and D O B, and D (c) Given the resulting charge of each disk measured in (b) is +3.0 μC, how many electrons would you need to add to a disk of this charge to electrically neutralize it? electrons

Physics for Scientists and Engineers: Foundations and Connections

1st Edition

ISBN:9781133939146

Author:Katz, Debora M.

Publisher:Katz, Debora M.

Chapter26: Electric Potential

Section: Chapter Questions

Problem 72PQ: Problems 72, 73, and 74 are grouped. 72. A Figure P26.72 shows a source consisting of two identical...

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Four charged particles are at rest at the corners of a square (Fig. P26.14). The net charges are q1 = q2 = +2.65 C and q3 = q4 = 5.15 C. The distance between particle 1 and particle 3 is r13 = 1.75 cm. a. What is the electric potential energy of the four-particle system? b. If the particles are released from rest, what will happen to the system? In particular, what will happen to the systems kinetic energy?
The fundamental charge is e = 1.60 1019 C. Identify whether each of the following statements is true or false. (a) Its possible to transfer electric charge to an object so that its net electric charge is 7.5 times the fundamental electric charge, e. (b) All protons have a charge of +e. (c) Electrons in a conductor have a charge of e while electrons in an insulator have no charge.
Four charged particles are at rest at the corners of a square (Fig. P26.14). The net charges are q1 = q2 = 2.65 C and q3 = q4 = 5.15 C. The distance between particle 1 and particle 3 is r13 = 1.75 cm. a. What is the electric potential energy of the four-particle system? b. If the particles are released from rest, what will happen to the system? In particular, what will happen to the systems kinetic energy as their separations become infinite? FIGURE P26.14 Problems 14, 15, and 16.
An electron with a speed of 3.00 106 m/s moves into a uniform electric field of magnitude 1.00 103 N/C. The field lines are parallel to the electrons velocity and pointing in the same direction as the velocity. How far does the electron travel before it is brought to rest? (a) 2.56 cm (b) 5.12 cm (c) 11.2 cm (d) 3.34 m (e) 4.24 m
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Assume the charged objects in Figure OQ19.15 are fixed. Notice that there is no sight line from the location of q2 to the location of q1. If you were at q1, you would be unable to see q2 because it is behind q3. How would you calculate the electric force exerted on the object with charge q1? (a) Find only the force exerted by q2 on charge q1. (b) Find only the force exerted by q3 on charge q1. (c) Add the force that q2 would exert by itself on charge q1 to the force that q3 would exert by itself on charge q1. (d) Add the force that q3 would exert by itself to a certain fraction of the force that q2 would exert by itself. (e) There is no definite way to find the force on charge q1. Figure OQ19.15
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Problems 72, 73, and 74 are grouped. 72. A Figure P26.72 shows a source consisting of two identical parallel disks of radius R. The x axis runs through the center of each disk. Each disk carries an excess charge uniformly distributed on its surface. The disk on the left has a total positive charge Q, and the disk on the right has a total negative charge Q. The distance between the disks is 3R, and point A is 2R from the positively charged disk. Find an expression for the electric potential at point A between the disks on the x axis. Approximate any square roots to three significant figures. FIGURE P26.72 Problems 72, 73, and 74.
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