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Coupling Factor

http://www.iso.org/iso/home/store/catalogue_tc/catalogue_detail.htm?csnumber=31891

http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=161-03-18

For inductive coupling between two inductive elements, \(k = \frac{\left | L_{mn} \right |}{\sqrt{L_m L_n}}\), where \(L_m\) and \(L_n\) are their self inductances, and \(L_{mn}\) is their mutual inductance.

"Coupling Factor" is the ratio of an electromagnetic quantity, usually voltage or current, appearing at a specified location of a given circuit to the corresponding quantity at a specified location in the circuit from which energy is transferred by coupling.

k