A current of 5 A is passing through a metallic wire of cross- sectional area `4 xx 10^(-6) m^(2)`. If the density of charge carries of the wire is `5 xx 10^(26) m^(-3)`, the drift velocity of the electrons will be

Options

A. `1 xx 10^(2) ms^(-1)`
B. `1.56 xx 10^(-2) ms^(-1)`
C. `1.56 xx 10^(-3) ms^(-1)`
D. `1 xx 10^(-2) ms^(-1)`

Answer

B

Explanation

Drift velocity `v_(d) = (1)/(eAn)`
or `v_(d) = (5)/((1.6xx10^(-19))xx(4 xx 10^(-6))xx(5 xx 10^(26))) ms^(-1)`
`1/64 ms^(-1) = 0.0156 ms^(-1)`