Line Integrals and Potentials
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Conservative scalar fields
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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.
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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
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