Electric currents and magnetic fields are closely related. If you have one, you often have (or can make) the other. The braking force in the demonstration is due to an eddy current. That's an ...
IN a paper entitled “Eddy Current Losses in Single-Conductor Paper-Insulated Lead-Covered Un-armoured Cables of a Single-Phase System“(J. Inst. Elec. Eng., 89, Pt. 2, No. 12 ; December 1942 ...
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