InterviewSolution
Saved Bookmarks
InterviewSolution
| 1. |
A Steady current flows in a metalic conductor of non uniform cross section. The quantity/quantities which remain constant along the length of the conductor is/areA. Current electric field and drift speedB. Drift speed onlyC. Current and drift speedD. Current only |
|
Answer» Correct Answer - D (d) If `E` is the electric field, then current density `J = sigma E` Also we know that current density `J = (i)/(A)` Hence `j` is difference for different area of cross-section. When `j` is different, then `E` is also different. Thus `E` is not constant. The drift velocity `v_(d)` is given by `v_(d) = (j)/(n e)` only current `i` will be constant. |
|