Hall Effect: If a strip of conducting material carries current in the presence of a transverse magnetic field, An emf is produced between the two edges of conductor. This phenomenon is called Hall Effect. The magnitude of the voltage depends upon the current, flux density and the property of conductor.
Diagram of hall Effect transducer:
Fig. above shows a Hall Effect element/transducer. Current is passed through leads 1 and 2 of the strip. The output leads connected to edges 3 and 4 are at the same potential when there is no transverse magnetic field passing through the strip. When a transverse magnetic field passes through the strip, an output voltage appears across the output leads, given by,
EH = KH IB/t
Where, KH = Hall Effect coefficient I = current B = flux density t = thickness of strip thus the voltage produced may be used for measurement of either the current I or the magnetic field strength B.
Applications: 1) Magnetic to Electric transducer 2) Measurement of displacement 3) Measurement of current 4) Measurement of power