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Hall effect can be used to measure

Answer Posted / pappu

Magnetic Field. https://en.wikipedia.org/wiki/Hall_effect
If Magnetic Field is a known quantity then Hall Effect can be used to measure proximity and velocity also. With 4 hall devices in a wheatstone bridge you can even measure direction of magnetic field. This is how you can see directions (North) on your smart phone. Next time just Google for Hall Effect.

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