Dictionary:Line source

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{{#category_index:L|line source}} A source of energy that can be treated mathematically as though it were condensed into an infinitely long line. (a) In the seismic method, events that appear to emanate from a line, such as a diffraction from a fault. (b) In the gravity and magnetic methods, line sources represent a concentration of mass or magnetized matter (such as a horizontal cylinder treated as having the mass concentrated along the axis of the cylinder). (c) In electrical methods, a long current-carrying wire can often be regarded as a line source. Usually the current is taken to be equiphase along the wire. In the near-field zone the magnetic field varies inversely with distance for a line source, inversely with distance squared for an electric dipole, and inversely with distance cubed for a magnetic dipole.