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# ch29(2) - The Electric Potential of Many Charges The...

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29 The Electric Potential of Many Charges The Electric Potential of Many Charges The electric potential V at a point in space is the sum of the potentials due to each charge: where r i is the distance from charge q i to the point in space where the potential is being calculated. In other words, the electric potential, like the electric field, obeys the principle of superposition.

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30 EXAMPLE 29.10 The potential of two charges EXAMPLE 29.10 The potential of two charges QUESTION:
31 Compute the potential of a ring of charge Compute the potential of a disk of charge

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32 The Electric Potential Inside a Parallel-Plate The Electric Potential Inside a Parallel-Plate Capacitor Capacitor The electric potential inside a parallel-plate capacitor is where s is the distance from the negative electrode. The electric potential, like the electric field, exists at all points inside the capacitor. The electric potential is created by the source charges on the capacitor plates and exists whether or not charge q is inside the capacitor.
33 EXAMPLE 29.7 A proton in a capacitor EXAMPLE 29.7 A proton in a capacitor QUESTIONS:

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34
35 Summary - General Principles Summary - General Principles

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36 Summary - General Principles Summary - General Principles
37 Applications Applications

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38 Summary - Applications Summary - Applications
39 Applications Applications

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