A semiconductor plate with a resistivity of 10 ^ -5 Ohm * m and a thickness of a = 0.2 mm is placed in a magnetic field by induction of 1 T, directed along a. A current of 0.1 A is passed along the plate perpendicular to the field. In this case, a transverse potential difference of 3.25 * 10 ^ -3 V occurs (Hall effect). Determine the mobility of current carriers in a semiconductor.

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