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Line Integrals and Potentials


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Conservative scalar fields


Equations are omitted for technical reasons - download the original pdf

Since, for any line integral that is independent of path in a domain D, the value of the integral is zero, this means that the work done (energy expended) in such a field in moving from a point A back to A is zero. Thus, all potential fields are conservative, meaning mechanical energy is conserved and no work is expended in moving around a closed loop. Obvious examples are the gravitational and electrical potentials. Friction tends to dissipate the energy of particles moving. If friction can be ignored the field is conservative; otherwise it is called nonconservative or dissipative.
Contents of
Line Integrals and Potentials

1 Line integrals that are independent of path
2 Curve of integration
3 Line integrals
4 Potentials
5 Proof of the theorem
6 The line integral depends on path
7 Potentials and integration around a closed curve
8 The line integral does not depend on the parameter
9 Conservative scalar fields
10 Work integral
11 Work done is equal to gain in kinetic energy
12 Exact differential forms
13 Simply connected domains
14 Exactness and independence of path

Related articles: (1) The Curl of a Vector Field, (2) Line Integrals and Potentials