1.

A conductor wire having 10 free electrons/m' carries a current of 20 A. If the crossection of wire is 1 mm², then the drift velocity of electrons will be(A) 6.25 x 10 ms" (B) 1.25 x 10 ms" (C) 1.25 x 10-'ms' (D) 1.25 x 109 ms"

Answer»

I = neAV20=10^29x1.6x10^(-19)x1x10^(-4)xVV=1.25x10^(-5)answer is B



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