A copper wire of length l and diameter d has potential difference V applied at its two ends. The drift velocity is V. If the diameter of wire is made d/4, then drift velocity becomes
A. V/16
B. 16V
C. V
D. V/4
Answer:A
A copper wire of length l and diameter d has potential difference V applied at its two ends. The drift velocity is V. If the diameter of wire is made d/4, then drift velocity becomes
A. V/16 B. 16V C. V D. V/4
Explanation: Drift velocity is inversely propotional to area of material i.e, V=I/nAq.