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A permanent magnet was placed in the middle of the http://www.saspens.org
pool of mercury. When a current was passed through the wire, the wire rotated around the magnet, showing that the current gave rise to a circular magnetic field around http://www.kovrdza.com
the wire. This motor is often demonstrated in school physics classes, but brine (salt water) is sometimes used in place of the toxic mercury. This is the simplest form of a http://www.kovrdza.com
class of electric motors called homopolar motors. A later refinement is the Barlow\'s Wheel. These were demonstration devices, unsuited to practical applications due to limited power.
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A permanent magnet was placed in the middle of the http://www.saspens.org pool of mercury. When a current was passed through the wire, the wire rotated around the magnet, showing that the current gave rise to a circular magnetic field around http://www.kovrdza.com the wire. This motor is often demonstrated in school physics classes, but brine (salt water) is sometimes used in place of the toxic mercury. This is the simplest form of a http://www.kovrdza.com class of electric motors called homopolar motors. A later refinement is the Barlow\'s Wheel. These were demonstration devices, unsuited to practical applications due to limited power.