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Find the average drift speed of free el...

Find the average drift speed of free electrons in a copper wire of area of cross-section `10^(-7) m^(2)` carrying current of 1.5 A and having free electron density `8.5 xx 10^(28) m^(-3)`

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`I = 1.5 A, A = 10^(-7) m^(2), n = 8.5 xx 10^(28) m^(-3), e = 1.6 xx 10^(-19) C`
Expression for current in terms of drift speed `I = "ne" Av_(d)`
`therefore V_(d) = (I)/("ne"A) = (1.5)/(8.5 xx 10^(28) ms^(-1) xx 1.6 xx 10^(-19) xx 10^(-7))` m/s
` = 1.1 xx 10^(-3) ms^(-1) = 1.1 mms^(-1)`
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