5th Edition

ISBN: 9780321976444

Author: James S. Walker

Publisher: PEARSON

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Water constitutes about 70% of earth. Some important distinguishing properties of water are high molar concentration, small dissociation constant and high dielectric constant.

Electrostatic Potential and Capacitance

An electrostatic force is a force caused by stationary electric charges /fields. The electrostatic force is caused by the transfer of electrons in conducting materials. Coulomb’s law determines the amount of force between two stationary, charged particle…

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Textbook Question

Chapter 20, Problem 92GP

Predict/Calculate Computer Keyboards Many computer keyboards operate on the principle of capacitance. As shown in Figure 20-18, each key forms a small parallel-plate capacitor whose separation is reduced when the key is depressed. (a) Does depressing a key increase or decrease its capacitance? Explain. (b) Suppose the plates for each key have an area of 47.5 mm² and an initial separation of 0.550 mm. In addition, let the dielectric have a dielectric constant of 3.75. If the circuitry of the computer can detect a change in capacitance of 0.425 pF, what is the minimum distance a key must be depressed to be detected?

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Chapter 20, Problem 91GP

Chapter 20, Problem 93GP

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Chapter 20 Solutions

Physics (5th Edition)

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