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AP Physics 2
11.1 Electric Current
IntermediateMCQMathematicalConceptual13.4k
A horizontal diagram showing four connected cylindrical wire segments arranged end-to-end from left to right along a single horizontal axis. An arrow on the far left points rightward into the wire, labeled with current \(I\). From left to right: the first segment is labeled W, drawn with length \(L\) and vertical diameter \(D\); the second segment is labeled X, drawn with length \(L\) and a wider vertical diameter \(2D\); the third segment is labeled Y, drawn with length \(2L\) and vertical diameter \(D\); the fourth segment is labeled Z, drawn with length \(2L\) and vertical diameter \(2D\). All segments share a common horizontal centerline and have solid outlines with light gray shading. Dimension lines indicate the lengths and diameters of each segment. No other labels, lines, text, or axes appear.
Four cylindrical wire segments connected in series carrying a steady current.
A single continuous copper wire carrying a constant current \(I\) consists of four cylindrical segments connected in series: segment W has diameter \(D\) and length \(L\), segment X has diameter \(2D\) and length \(L\), segment Y has diameter \(D\) and length \(2L\), and segment Z has diameter \(2D\) and length \(2L\). Which of the following correctly ranks the magnitude of the electron drift velocity, \(v_d\), in the four segments?

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