A hypothetical metal is known to have an electrical resistivity of 3.3 × 10–8 (Ω•m). A current of 25 A is passed through a specimen of this metal 15 mm thick. When a magnetic field of 0.95 tesla is simultaneously imposed in a direction perpendicular to that of the current, a Hall voltage of -2.4 × 10–7 V is measured. Compute the following:
(a) the electron mobility for this metal
(b) the number of free electrons per cubic meter
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