hat is the Hall effect and what is the significance of a positive Hall coefficient? A potential difference is applied between the ends of a strip of copper and a current of 100 A flows along its length. The strip is 20 cm long in the xdirection of a rectangular system of coordinates, 2 cm wide in the ydirection and 1 mm thick in thezdirection. A uniform magnetic field of 10 Wb/m2 is applied across the strip in the positive ydirection and the hall EMF is found to be 5nV Derive (a) the magnitude and direction of the Hall field when the current flows in the positivexdirection and (b) the concentration of free electrons.
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