When current I flows through a wire, the drift velocity of the electrons is v. When current 21 flows through another wire of the same material having double the length and area of cross-section, the drift velocity of the electrons will be-
A. \(\frac { v }{ 4 }\)
B. \(\frac { v }{ 2 }\)
C. v
D. 2 v
Answer:C
When current I flows through a wire, the drift velocity of the electrons is v. When current 21 flows through another wire of the same material having double the length and area of cross-section, the drift velocity of the electrons will be-
A. \(\frac { v }{ 4 }\) B. \(\frac { v }{ 2 }\) C. v D. 2 v