| A constant current I is flowing along the length of a conductor of variable cross-section as shown in the fig. |
| The quantity which does not depend upon the area of cross-section is : |
 |
A) electron density
B) current density
C) drift velocity
D) electric field
Correct Answer: A
Solution :
When a constant current is flowing through a conductor of non-uniform cross-section, electron density does not depend upon the area of cross section, while current density, drift velocity and electric field all vary inversely with area of cross-section.
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