Q. Two identical conductors maintained at same temperatures are given potential differences in the ratio 1 : 2. Then the ratio of their drift velocities is
A) 1 : 2
B) 3 : 2
C) 1 : 1
D) $1\ :2^{1/2}$
Explanation
(a) Drift velocity, $v_{d} = \frac{e\tau V}{mL}\ \left\lbrack \because E = \frac{V}{L} \right\rbrack$
Where the symbols have their usual meaning
If the temperature are not same, $\tau$ cannot be same. Then none of the given options is correct
If temperatures are same, then $\frac{v_{d_{1}}}{v_{d_{2}}} = \frac{V_{1}}{V_{2}} = \frac{1}{2}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.