AP Physics C: E&M
11.1 Electric Current
A cylindrical copper wire with radius \(r_1\) carries a steady current \(I\). A second cylindrical copper wire with radius \(r_2 = 2r_1\) carries the same current \(I\). If \(v_{d,1}\) and \(v_{d,2}\) are the average electron drift speeds in the first and second wires, respectively, what is the ratio \(\dfrac{v_{d,1}}{v_{d,2}}\)?
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