Conductor number conduction |CurrentElectricityJEEMAIN2019

JEE MAIN 2019

09-04-2019 S2

Question

In a conductor, if the number of conduction electrons per unit volume is $8.5 \times 10^{28} \mathrm{~m}^{-3}$ and mean free time is 25 fs (femto second), it's approximate resistivity is $$ \left(\mathrm{m}_{\mathrm{e}}=9.1 \times 10^{-31} \mathrm{~kg}\right) $$

Select the correct option:

$10^{-5} \Omega \mathrm{~m}$

$10^{-6} \Omega \mathrm{~m}$

$10^{-7} \Omega \mathrm{~m}$

$10^{-8} \Omega \mathrm{~m}$

✓ Correct! Well done.

✗ Incorrect. Try again or view the solution.

Solution