There is a copper wire of length 2.2 m, of area of cross-section 2.0sq.mm, carrying a current of 6.0A. If the number density of electrons in copper is `8.5 xx10^(28) m^(-3)`, find the time taken by an electron to drift from one end to another end of the wire.
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Here, `l =2.2m` , `A=2.0 sq. mm =2xx10^(-6) sq.m`, `I=6A , n=8.5xx10^(28)m^(-3)` Drift velocity, `v_(d) =I/(n A e)` `6/((8.5xx10^(28))xx (2xx10^(-6))xx(1.6xx10^(-19)))` `=2.2xx10^(-4) ms^(-1)` Time of drifting the electron, `t=l/v_(d) =(2.2)/(2.2xx10^(-4))=10^(4)s`
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