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.