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-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
me
kg)
(3) 10 Ω-m1
(c) 10-22-m
(b) 10-52-m
(d) 10-82-m

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