Q. A potential difference $V$ is applied to a copper wire of length $l\ $and thickness $d$. If $V$ is doubled, the drift velocity
A) Is doubled
B) Is halved
C) Remains same
D) Becomes zero
Explanation
(a) $v_{d} = \frac{eE}{m}\tau = \frac{e}{m}\tau\left( \frac{V}{l} \right)\ or\ V_{d}\infty V$
Therefore, drift velocity is doubled
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.