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
View Solution FreeTopic: Current Electricity and Electrical Instrument·Practice all Current Electricity and Electrical Instrument questions
More Current Electricity and Electrical Instrument Questions
A battery of emf E and internal resistance r is connected across a resistance R. Resistance R can be adjusted to any val...Three 60W, 120W light bulbs are connected across a 120 V power source. If resistance of each bulb does not change with c...Reading of ammeter in ampere for the following circuit is :-...By mistake, a voltmeter is placed in series and an ammeter in parallel with a resistance in an electric circuit, with a ...Four wire of the same diameter are connected in turn between two points, maintained at a constant difference. Their resi...