Q. Current flows through a metabolic conductor whose area of cross-section increases in the direction of the current. If we move in this direction,
A) The carrier density will change
B) The current will change
C) The drift velocity will decrease
D) The drift velocity will increase
Explanation
(c) $i = nAev_{d}$
or $v_{d} = \frac{i}{nAe}ie,\ \ v_{d} \propto \frac{1}{A}$
As $A$ increases $v_{d}$ decreases, because $i$ remains constant
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.