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AP Physics C: E&M
12.4 Ampère’s Law
12.3 Magnetic Fields of Current-Carrying Wires and the Biot-Savart Law
IntermediateMCQGraphicalMathematicalProportional Analysis16.8k
Magnetic field magnitude versus inverse distance from a long straight wire.
Magnetic field magnitude versus inverse distance from a long straight wire.
A student measures the magnetic field magnitude \(B\) at various perpendicular distances \(r\) from a long, straight wire carrying a steady current \(I\). The student plots \(B\) as a function of \(\dfrac{1}{r}\) and fits a line of best fit to the data, as shown in the graph. Based on the graph, what is the current \(I\) in the wire?

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