Current Electricity and Electrical InstrumentHard
Question
Three copper rods are subjected to different potential difference. Compare the drift speed of electrons through them. Assume that all 3 are at the same temperature.
Length Diameter Potential difference
(1) L d V
(2) 2L d 2V
(3) 3L 2d 2V
Length Diameter Potential difference
(1) L d V
(2) 2L d 2V
(3) 3L 2d 2V
Options
A.v1 = v2 > v3
B.v1 > v2 > v3
C.v1 < v2 < v3
D.None of these
Solution
Vd = 
V = El ⇒ E =
so 
V1 =
, V2 = 
and V3 = 
so V1 = V2 > V3
V = El ⇒ E =
so V1 =
, V2 = and V3 = so V1 = V2 > V3Create a free account to view solution
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