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:(a) current(b) drift velocity(c) electric field(d) current density

Answer 1

drift is the right answer

Answer 2

Answer:

D) Current density

Explanation:

As the cross sectional area of the conductor is non uniform thus the current density will be different.

Potential Difference is denoted as- Vb-Va = w/q

where, J = I/A

Since = I = JA

Thus, when an area increases the current density decreases. This denotes that the number of flow of electrons will be same and thus the current will be constant. Therefore, The quantity which remains constant along the conductor is current density