If potential difference applied across a conductor is increased from V to 2V, how the drift velocity of the electron charge?

Explanation

Drift velocity of the electron is given by
`v_(d)=(eE tau)/(m)=(eV tau)/(ml)`
`therefore v_(d) prop V`
`rarr (v._(d))/(v_(d))=(2V)/(V ) = 2 rarr v_(d)=2v_(d)`