Capacitance and Dielectrics-1

# Capacitance and Dielectrics-1 - Introduction to Capacitance...

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Introduction to Capacitance Part A What property of objects is best measured by their capacitance? ability to store charge Correct Capacitance is a measure of the ability of a system of two conductors to store electric charge and energy. Capacitance is defined as . This ratio remains constant as long as the system retains its geometry and the amount of dielectric does not change. Capacitors are special devices designed to combine a large capacitance with a small size. However, any pair of conductors separated by a dielectric (or vacuum) has some capacitance. Even an isolated electrode has a small capacitance. That is, if a charge is placed on it, its potential with respect to ground will change, and the ratio is its capacitance . Part B Assume that charge is placed on the top plate, and is placed on the bottom plate. What is the magnitude of the electric field between the plates? Express in terms of and other quantities given in the introduction, in addition to and any other constants needed.

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