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Thursday, October 2, 2008

Fundamentals: Potential gradient

Potential gradient is change in potential per unit length. Since F = EQ , work done by force W = F d. Work done by the electric force is equal to decrease in potential energy. This is similar to gravitation where weight on a body acting downwards result in loss in potential energy. Work done per unit charge is potential . Hence drop in potential V = Ed and potential gradient V/d = E numerically.