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AP Physics C: E&M
11.1 Electric Current
BeginnerMCQMathematical20.6k
A horizontal copper wire consisting of two coaxial cylindrical sections connected end-to-end. The left section is narrower, with a radius labeled R. The right section is wider, with a radius labeled 2R. A rightward arrow labeled I indicates a steady current flowing through both sections. No other labels, lines, text, or axes appear.
A copper wire with two cylindrical sections of radii R and 2R.
A copper wire consists of two cylindrical sections connected end-to-end, carrying a steady electric current \(I\). Section 1 has a radius \(R\), and Section 2 has a radius \(2R\). Let \(J_1\) and \(J_2\) be the current densities in Sections 1 and 2, respectively, and let \(v_{d1}\) and \(v_{d2}\) be the electron drift velocities in Sections 1 and 2, respectively. Which of the following correctly pairs the ratio \(\dfrac{J_1}{J_2}\) with the ratio \(\dfrac{v_{d1}}{v_{d2}}\)?

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