Question

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Answer 1

Answer:

(a) 3.2 × 10⁴ s

Explanation:

The formula for microscopic Ohm's law is-

$I=neAV_d$

where,

 $I$ = current

 $n$ = no. of free electrons per unit volume

 $e$ = charge on electron

 $A$ = cross sectional area

 $V_d$ = Drift velocity, velocity of electrons in conductor.

$V_d$ can also be denoted as $\frac{length}{time}$

Hence,

$V_d = \frac{I}{neA}\\\\\frac{length}{time}=\frac{I}{neA}\\\\time=\frac{neAl}{I}\\\\time=\frac{10^{29}~*~(1.6~*~10^{-19})~*~10^{-6}~*~4}{2}\\\\time=3.2\,*\,10^4\,s$