Overview
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Two electrode plates are modeled and arranged in parallel, which has the
basic structure of a capacitor. When the different electric potential is
constantly applied to each plate, electric charge stored in the electrode
plates varies with the relative permittivity of the dielectric material
between the electrode plates.
This example presents the use of an electric field analysis to obtain the
electric charges of both the air and the high permittivity material when
they are placed between the plates of a capacitor as well as the capacitance. |
Electric Field Distribution
| The electric field distribution produced between the electrode plates when
there is an electric potential difference is indicated in Fig. 1. A large
electric field is concentrated in the corners of the electrode when the
permittivity is air because more of the electric field expands to the air
from the opposite electrode plate. |
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Capacitance Calculation
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The charge density produced on the surface of the electrode plate is indicated
in Fig. 2. The surface electrode charge is larger than that of the air
when the high permittivity material is used. |
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The capacitance is calculated using the surface electric charge and the
given electric potential difference. The result is shown in Table 1. |
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