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A conductor has density d and molar mass...

A conductor has density `d` and molar mass `M`. A wire made of this conductor has cross sectional radius `r`. Calculate the drift speed of electrons in this conductor when current through it is `I`. Assume that each atom contributes one free electron.

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The correct Answer is:
`(IM)/(pir^(2)e.d.N_(A))`
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