Principles of speedometer
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When the vehicle is in motion, a speedometer gear assembly turns a speedometer cable, which then turns the speedometer mechanism itself. ... The effect is that the magnet exerts a torque on the cup, "dragging" it, and thus the speedometer pointer, in the direction of its rotation with no mechanical connection between them.
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An instrument on a vehicles dashboard which indicates the speed of the vehicle when it is running,is called speedometer.
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