A conductor wire having 1029 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 × 10-19 C )

Question

A conductor wire having 1029 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 × 10-19 C ) (A) 1.25 × 10-4 ms -1 (B) 1.25 × 10-3 ms -1 (C) 1.25 × 10-5 ms -1 (D) 6.25 × 10-3 ms -1

Tardigrade Admin · Accepted Answer

i=n e A Vd 20=1029 × 1.6 × 10-19 × 10-6 × Vd Vd=1.25 × 10-3 m / s

Q. A conductor wire having $1 0^{29}$ free electrons $/ m^{3}$ carries a current of $20 A$ . If The cross section of the wire is $1 m m^{2}$ then the drift velocity of electrons will be $(e = 1.6 \times 1 0^{- 19} C)$

$1.25 \times 1 0^{- 4} m s^{- 1}$

$1.25 \times 1 0^{- 3} m s^{- 1}$

$1.25 \times 1 0^{- 5} m s^{- 1}$

$6.25 \times 1 0^{- 3} m s^{- 1}$

$i = n e A V_{d}$
$20 = 1 0^{29} \times 1.6 \times 1 0^{- 19} \times 1 0^{- 6} \times V_{d}$
$V_{d} = 1.25 \times 1 0^{- 3} m / s$

Q. A conductor wire having 1029 free electrons /m3 carries a current of 20A. If The cross section of the wire is 1mm2 then the drift velocity of electrons will be (e=1.6×10−19C)

1.25×10−4ms−1

1.25×10−3ms−1

1.25×10−5ms−1

6.25×10−3ms−1