A conductor of length L is connected to a dc source of emf `epsilon`. If this conductor is replaced by another conductor of same material and same area of cross-section but of length 3L, how will the drift velocity change?

Answer

`(upsilon_(d))/(3)`

Explanation

`I = mA e upsilon_(d) or (epsilon)/(R ) = nA e upsilon_(d) ( :' I = epsilon//R )`
or `(epsilon)/((rhol//A)) = nA e upsilon_(d) [ :'R = (rhol)/(A)]`
or `(epsilon)/(rhol) = n e upsilon_(d) or upsilon_(d)= (epsilon)/(n erhol)` i.e. `upsilon_(d) prop(1)/(l)`
`:. (upsilon'_(d))/( upsilon_(d)) = (l)/(3l) or (upsilon'_(d))/(3)`