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AP Physics C: E&M
11.3 Resistance, Resistivity, and Ohm’s Law
11.1 Electric Current
BeginnerMCQMathematicalConceptual21k
A wire with two segments of different cross-sectional areas carrying a steady current.
A wire with two segments of different cross-sectional areas carrying a steady current.
A cylindrical conductor with uniform resistivity \(\rho\) carries a steady current \(I\). The conductor consists of two segments joined end-to-end: Segment 1 has a cross-sectional area \(A_1 = A\), and Segment 2 has a cross-sectional area \(A_2 = 2A\).

Which of the following correctly compares the electric field magnitude \(E\) and the total electric current \(I\) in Segment 1 to those in Segment 2?

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