Question
Across a metallic conductor of non-uniform cross -section, a constant potential difference is applied. The quantity which remains constant along the conductor is
-
Current density
-
Current
-
drift velocity
-
electric field
Solution
B.
Current
As the cross-sectional area of the conductor is non-uniform so current density will be different.
As, I=JA
It is clear from Eq. (i) when an area increases the current density decreases so the number of the flow of electrons will be same and thus the current will be constant.
