question_answer

In a conductor, if the number of conduction electrons per unit volume is \[8.5\times {{10}^{28}}\text{ }{{m}^{3}}\] and mean free time is 25ƒs (fem to second), it's approximate resistivity is :- \[\left( {{m}_{e}}=9.1\times {{10}^{31}}kg \right)\] [JEE Main 9-4-2019 Afternoon]

A) \[{{10}^{-5}}\Omega m\]

B) \[{{10}^{-6}}\Omega m\]

C) \[{{10}^{-7}}\Omega m\]

D) \[{{10}^{-8}}\Omega m\]

Correct Answer: D

Solution :

[d]