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 x-direction of a rectangular system of coordinates, 2 cm wide in the y-direction and 1 mm thick in thez-direction. A uniform magnetic field of 10 Wb/m2 is applied across the strip in the positive y-direction 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 positivex-direction and (b) the concentration of free electrons.
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