A hypothetical metal is known to have an electrical resistivity of 4 × 10–8 (Ω • m). A current of 30 A is passed through a specimen of this metal that is 25 mm thick. When a magnetic field of 0.75 tesla is simultaneously imposed in a direction perpendicular to that of the current, a Hall voltage of –1.26 × 10–7 V is measured. Compute (a) the electron mobility for this metal and (b) the number of free electrons per cubic meter.
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