| http://www.w3.org/ns/prov#value | - When it is desired to test a strip which is not ferromagnetic but electrically conducting, the vibration may also be excited by these a.c. solenoids because the magnetic stray field extending from pole piece to pole piece traverses the strip and gives rise to eddy currents so that the strip must be considered as an electric conductor in a magnetic field and is subjected to a force which pulsates i
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