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
Consider a cylindrical element as shown in the figure. Current flowing the through element is I and resistivity of mater...The resistance of the galvanometer is 25 Ω it gives a full scale deflection when a current of 10mA is passed throug...A meter bridge is set-up as shown, to determine an unknown resistance ′X′ using a standard 10 ohm resistor. ...In producing chlorine by electrolysis 100 kW power at 125 V is being consumed. How much chlorine per minute is liberated...The reading of the ammeter for a silicon diode in the given circuit is :-...