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Khan Academy
Khan Academy: Using a Line Integral to Find the Work Done by a Vector Field
Using a line integral to find the work done by a vector field example.
Khan Academy
Khan Academy: Vector Field Line Integrals Dependent on Path Direction
Video lesson using line integrals in a vector field for a path in opposite directions. Gives the intuition and then shows that the results will have opposite signs.
Khan Academy
Khan Academy: Example of Closed Line Integral of Conservative Field
Example of taking a closed line integral of a conservative field