A constant potential difference is applied between the ends of the wire. If the length of the wire is…
A constant potential difference is applied between the ends of the wire. If the length of the wire is elongated 4 times, then the drift velocity of electrons will be
increases $4$ times
decreases $4$ times
increases $2$ times
decreases $2$ times
Solution
$v_d \propto \frac{1}{l} \frac{v_{d_1}}{v_{d_2}}=\frac{I_1}{I_2}=\frac{4 I}{I} \Rightarrow v_{d_2}=\frac{v_{d_1}}{4}$
So drift velocity will decrease by 4 times