A current of `5 A` is passing through a metallic wire of cross-section area `4 xx 10^-6 m^2`. If the density of the charge carries in the wire is `5 xx 10^36 //m^3`, the drift velocity of the electrons is.

Options

A. `(1)/(16) m//sec`
B. `(1)/(32) m//sec`
C. `(1)/(64) m//sec`
D. `(1)/(128) m//sec`

Answer

C

Explanation

`i= ne A v_d`
`5 = 5 xx 10^26 xx 1.6 xx 10^-19 xx 4 xx 10^-6 v_d`
`v_d = (1)/(64) m//sec`.