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Lecture_8

# Lecture_8 - Round Trip Potential Difference Potential...

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Potential difference due to a stationary point charge is independent of the path Potential difference along a closed loop is zero Round Trip Potential Difference +

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Metal is not in static equilibrium: When it is in the process of being polarized When there is an external source of mobile charges (battery) Δ V = E d l i f If a metal is not in static equilibrium, the potential isn’t constant in the metal. Potential in Metal Not in static equilibrium Nonzero electric field of uniform magnitude E throughout the interior of a wire of length L . Direction of the field follows the direction of the wire. For each step , the potential difference is: Δ V = - EL E Δ l
Is the following “curly” pattern of electric field possible? Δ V = E d l i f dl dl dl Δ V AA = E d l = El = E 2 π R 0 Predicting Possible Field Configuration E is always parallel to d l This “curly” pattern of electric field is impossible to produce by arranging any number of stationary point charges!

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Δ V = E d l i f EL V = Δ Wire in a Circuit and Electric Field Electric field is not confined to the wire in a circuit – there must be an electric field E around the wire in the air! In a current-carrying wire in a circuit, there can be a nonzero electric field, so there is a difference in potential between two locations in the wire.
Method 1: Divide into point charges and

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Lecture_8 - Round Trip Potential Difference Potential...

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