Q.The drift velocity of electrons in a copper wire of cross-sectional area $1$ mm² carrying a current of $1$ A is (given $n = 8.5 \times 10^{28}$ m⁻³, $e = 1.6 \times 10^{-19}$ C)

7.4 \times 10^{-6}

m/s

1.18 \times 10^{-5}

m/s

3.7 \times 10^{-5}

m/s

1.18 \times 10^{-4}

m/s

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Q.The drift velocity of electrons in a copper wire of cross-sectional area 111 mm² carrying a current of 111 A is (given n=8.5×1028n = 8.5 \times 10^{28}n=8.5×1028 m⁻³, e=1.6×10−19e = 1.6 \times 10^{-19}e=1.6×10−19 C)