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AP Physics C: E&M
12.4 Ampère’s Law
IntermediateMCQConceptual19.8k
Square path centered on a long current-carrying wire.
Square path centered on a long current-carrying wire.
A long, straight wire carries a constant current \(I\) out of the page. A student considers using Ampère's law with a square closed path of side length \(2r\) centered on the wire, in the plane of the page, to find the magnetic field magnitude at a distance \(r\) from the wire. Which of the following statements and justifications correctly evaluates the student's proposal?

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