Question 351: Current Electricity

Question

In a conductor, if the number of conduction
electrons per unit volume is 8.5 × 10
28
m
–3
and
mean free time is 25ƒs (femto second), it's
approximate resistivity is :-
(m
e
= 9.1 × 10
–31
kg)

Accepted Answer

$$ho  = {{2m} \over {n{e^2}	au }}$$
= 3.34 ÃÂ 10
Ã¢ÂÂ8
$$\Omega $$ m

Answer

10
–8
$$\Omega $$m

Answer

10
–7
$$\Omega $$m

Answer

10
–5
$$\Omega $$m

Answer

10
–6
$$\Omega $$m

Current Electricity

In a conductor, if the number of conduction electrons per unit volume is 8.5 × 10 28 m –3 and mean free time is 25ƒs (femto second), it's approximate resistivity is :- (m e = 9.1 × 10 –31 kg)

Choose the correct answer: