Current Electricity and Electrical InstrumentHard
Question
Two weirs each of radius cross section r but of different materials are connected to gather end to end (in series). If the densities of charge carries in the two wires are in the ratio 1: 4, the drift velocity of electrons in the two wires will in the ratio :
Options
A.1 : 2
B.2 : 1
C.4 : 1
D.1 : 4
Solution
j → Current density n → Current density
j = -nevd vd1 =
vd2 =
⇒ n = 4n1
= 4 : 1
j = -nevd vd1 =
vd2 =
⇒ n = 4n1 = 4 : 1Create 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
All the edges of a block in cuboidal shape with parallel faces are unequal. Its longest edge is twice its shortest edge....Four identical bulbs each rated 100 watt, 220 volts are connected across a battery as shown. The total electric power co...Two nonideal batteries are connected in parallel consider the following statements : (A) The equivalent emf is smaller t...The emf of a standard cell is balanced at 150 cm length of a potentiometer wire. When this cell is shunted by a 2ohm res...When the switches are arranged so that the current through the battery is minimum, what is the voltage across points A a...