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Hall effect provides a direct evidence of the existence of holes in semiconductors. In a typical Hall effect experiment, a magnetic field is applied in a direction perpendicular to the direction of current in a flat strip of a semiconductor. In the figure shown, the current flows along the length (positive x-direction) of the strip. |
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When a magnetic field is applied in a direction transverse to the current direction, a potential difference appears across the direction perpendicular to both current and the magnetic field. This transverse voltage is called the Hall voltage . |
