1.

What is drift velocity of free electrons ? Deduce I = n A eV_(d) where the symbols have their usual meaning.

Answer»

Solution :The average velocity with which free ELECTRONS move or drift under the infliuence of electric field.

L= length of the conductor
A = AREA of CROSS section
n = number of free electrons/unit VOLUME
e = charge of the electron
Total charge `q = n A el`
Drift velocity `V |_(d) =l/t or t = (l)/(V_(d))`
`I = (q)/(t)`
`I = ( n A el)/((l)/(V _(d))) = n A eV _(d)=l`


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