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Barlow's wheel

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Barlow's wheel

early demonstration of an electric motor

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About Barlow's wheel

Barlow's wheel was an early demonstration of a homopolar motor, designed and built by English mathematician and physicist Peter Barlow in 1822. It consists of a star-shaped wheel free to turn, suspended over a trough of the liquid metal mercury, with the points dipping into the mercury, between the poles of a horseshoe magnet. A direct electric current passes from the hub of the wheel, through the wheel into the mercury and out through an electrical contact dipping into the mercury. The Lorentz force of the magnetic field on the moving charges in the wheel causes the wheel to rotate.

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