In a conductor

PHYSICS · Single correct · CBSE · Physics · Current Electricity · Current Electricity

Problem

In a conductor, if the number of conduction electrons per unit volume is 8.5×1028 m−38.5 \times 10^{28} \text{ m}^{-3} and mean free time is 25 fs25 \text{ fs} (femto second), its approximate resistivity is: ( me=9.1×10−31 kgm_e = 9.1 \times 10^{-31} \text{ kg} ) (1) 10−6Ωm10^{-6} \Omega \text{m} (2) 10−7Ωm10^{-7} \Omega \text{m} (3) 10−8Ωm10^{-8} \Omega \text{m} (4) 10−5Ωm10^{-5} \Omega \text{m}

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