Speedometer

Eddy currents are used in the working of speedometer in automobiles. In a Speedometer, a magnet rotates according to the speed of the car. This magnet is placed inside an aluminum drum, which is carefully pivoted and held in position by a hair spring. When the inside magnet spins around, it sets up eddy currents in the drum and drags it through an angle which depends on the speed of the car.


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