Two parallel thin metal plates are as shown. The charge density on one plate is +00, and on the other -oo. How do the following change when the plates are moved closer together? Explain. (a) the charge density (b) the electric field between the plates (c) the capacitance of the plates. -a, +o, :Metal piaces on insulacing stands

Two parallel thin metal plates are as shown. The charge density on one plate is +00, and on the other -oo. How do the following change when the plates are moved closer together? Explain. (a) the charge density (b) the electric field between the plates (c) the capacitance of the plates. -a, +o, :Metal piaces on insulacing stands

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter5: Electric Charges And Fields

Section: Chapter Questions

Problem 98P: From a distance of 10 cm, a proton is projected with a speed of v=4.0106 m/s directly at a large,...

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A particle of mass m and charge q moves along a straight line away from a fixed particle of charge Q. When the distance between the two particles is r0 , q is moving with a speed v0 . (a) Use the work-energy theorem to calculate the maximum separation of the charges. (b) What do you have to assume about v0 to make this calculation? (c) What is the minimum value of v0 such that q escapes from Q?
(a) Calculate the number of electrons in a small, electrically neutral silver pin that has a mass of 10.0 g. Silver has 47 electrons per atom, and its molar mass is 107.87 g/mol. (b) Imagine adding electrons to the pin until the negative charge has the very large value 1.00 mC. How many electrons are added for every 109 electrons already present?
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A thin conducing plate 2.0 m on a side is given a total charge of 10.0C . (a) What is the electric field 1.0 cm above the plate? (b) What is the force on an electron at this point? (c) Repeat these calculations for a point 2.0 cm above the plate. (d) When the electron moves from 1.0 to 2.0 cm above the plate, how much work is done on it by the electric field?
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A long cylinder of aluminum of radius R meters is charged so that it has a uniform charge per unit length on its surface of . (a) Find the electric field inside and outside the cylinder, (b) Find the electric potential inside and outside the cylinder, (c) Plot electric field and electric potential as a function of distance from the center of the rod.
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