A conductor wire having 10^29 free electrons /m^3 carries a current of 20 A. If the cross-section of the wire is 1 mm^2, then the drift velocity of electrons will be ( e=1.6 10^-19C )

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Accepted Answer

Correct answer: B. (b) Here, I=20 A ,n=10^29 m^-3 A=1 mm^2=10^-6 m^2 ,e=1.6 10^-19C Drift velocity, v_d= l nAe = 20 A10^29 m^-3 10^-6 m^2 1.6 10^-19C =1.25 10^-3 m s^-1

$A conductor wire having 10^{29} free electrons / m^{3} carries a current of 20 A . If the cross-section of the wire is 1 mm^{2}, then the drift velocity of electrons will be (e = 1.6 \times 10^{- 19} C)$

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