-3 In a conductor, if the number of conduction electrons per unit volume is 8.5x1028 m and mean free time is 25 fs (femto second), it's approximate resistivity is (Take, m. = 9.1×10-³1 kg) (3) 10 Ω-m (c) 102-m (b) 10-52-m (d) 10-822-m
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