Neet Solved Paper 2015 Question 30
Question: Across a metallic conductor of non-uniform cross-section, a constant potential difference is applied. The quantity which remain constant along the conductor is
Options:
A) current density
B) current
C) drift velocity
D) electric field
Show Answer
Answer:
Correct Answer: B
Solution:
As the cross-sectional area of the conductor is non-uniform so current density will be different. As
$ I=JA $ …(i)
It is clear from Eq. (i), when area increases the current density decreases so the number of flow of electrons will be same and thus the current will be constant.
