Question

DC current flows in a metal pieces of non uniform cross section . which of these quantities remains constant along the condictor: current, current density or drift speed ?​

Answer 1

Answer:

Current is independent of the area of conductor so its remains constant.

Explanation:

Since it is given in the question that the DC current flows in a metal piece of a non-uniform cross-section.

As mentioned in the question that cross-section is nonuniform, so the area is changing across the length.

we know that current density is the ratio of current flowing in the conductor to the cross-section area.

we also the drift velocity ($V_{d}\ e\ n\ A=I$)

Drift velocity is the function of the area.

So, current density and drift velocity both are the function of the area which is changing so both quantities changing.

Current is independent of the area of the conductor so its remains constant.