| http://www.w3.org/ns/prov#value | - The predetermined frequency at which the metal (B) resonates mechanically to experience abrupt changes in flux density and permeability is peculiar to the length of that metal and defined by the following equation: ##EQU1## wherein n is an integer, l is the length of the metal (B), D is the Young's modulus of the metal (B), and ?? is the density of the metal (B).
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