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(C) The correct answer is current only.According to the principle of continuity for steady current,the current $I$ flowing through any cross-section o

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Current only

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(C) The correct answer is current only.According to the principle of continuity for steady current,the current $I$ flowing through any cross-section of a conductor remains constant,regardless of the area of the cross-section.Since $I = nAev_d$,where $n$ is the number density of electrons,$A$ is the area of cross-section,$e$ is the charge of an electron,and $v_d$ is the drift speed,if the area $A$ changes,the drift speed $v_d$ must change to keep the current $I$ constant.Similarly,the electric field $E$ depends on the current density $J = I/A$,so it also varies with the cross-sectional area.

Given a current-carrying wire of non-uniform cross-section,which of the following is constant throughout the length of the wire?

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