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Eddy currents produce a secondary field that cancels a part of the external field and causes some of the external flux to avoid the conductor. French physicist Léon Foucault (1819–1868) is credited with having discovered eddy currents. In September 1855, he discovered that the force required for the rotation of a copper disc becomes greater ...
Eddy-current testing ... Faraday discovered that when there is a closed path through which current can circulate and a time-varying magnetic field passes through a ...
In September 1855 he discovered that the force required for the rotation of a copper disc becomes greater when it is made to rotate with its rim between the poles of a magnet, the disc at the same time becoming heated by the eddy current or "Foucault currents" induced in the metal.
An electric current is a flow of charged ... Eddy currents are electric currents that occur in conductors exposed ... It was discovered by Heike Kamerlingh Onnes ...
A notable advance in the art of dynamo construction was made by Samuel Alfred Varley in 1866 [113] and by Siemens and Charles Wheatstone, [114] who independently discovered that when a coil of wire, or armature, of the dynamo machine is rotated between the poles (or in the "field") of an electromagnet, a weak current is set up in the coil due ...
The magnetic Lorentz force v × B drives a current along the conducting radius to the conducting rim, and from there the circuit completes through the lower brush and the axle supporting the disc. This device generates an emf and a current, although the shape of the "circuit" is constant and thus the flux through the circuit does not change ...
Displacement current; Eddy current; ... He discovered first an inverse relationship of the force between electric charges and the square of its distance ...
Current causes several observable effects, which historically were the means of recognising its presence. That water could be decomposed by the current from a voltaic pile was discovered by Nicholson and Carlisle in 1800, a process now known as electrolysis. Their work was greatly expanded upon by Michael Faraday in 1833.