1solve it plz
a current passses through an ohmic conductor of non uniform cross section .which are independent of cross section
(a)charge crossing in a given time interval
(b)drift speed
(c)current density
(d)free electron density
-
UP 0 DOWN 0 0 15
15 Answers
1a) charge crossing in a given time interval.. i dunno how its independent.
b) and c) everyone knows its dependent...
d) free e- density = free e- per unit volume... if A changes, length will also change to kp the density constant... so this is independent..
but how A?
thinkng//...................
11It can be proved I=nAev where I-->Current through the conductor.
n--> No of electrons per unit volume.
A--> area of cross section of conductor
e-->Charge on an electron.
v--> Drift velocity of each electron
Therefore
(A) q=nAevt --> Dependent on area of cross section.
(B) v= I/(nAev) --> Again dependent on area of cross section.
(C) Current density (J) =I/A
i think it should be (d) ... But i am not sure . Please correct me if i am wrong.
1think the charge entering the smaller end has to pass through the rest of part n thus tokeep i constant