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AP Physics 2
11.5 Compound Direct Current (DC) Circuits
11.3 Resistance, Resistivity, and Ohm’s Law
11.1 Electric Current
AdvancedMCQMathematicalConceptual16.6k
A schematic diagram showing a wire carrying current I_0 entering a T-junction that splits into two parallel branches, Wire 1 and Wire 2, both of length L. Wire 1 has a narrow circular cross section with radius r_1 = r. Wire 2 has a wider circular cross section with radius r_2 = 2r. Both branches rejoin at a common downstream node maintaining a potential difference Delta V across each branch. No other components or text appear.
Parallel wire branches with different radii.
An electrical wire carrying current \(I_0\) reaches a junction that splits into two parallel branches, Wire 1 and Wire 2, made of the same uniform conductive material and having equal length \(L\). The radius of Wire 2 is twice the radius of Wire 1 (\(r_2 = 2r_1\)). Both branches reconnect at a common downstream node so that the potential difference \(\Delta V\) across each branch is identical. Which of the following correctly compares the current density \(J\) and the electron drift velocity \(v_d\) in Wire 1 to those in Wire 2?

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