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AP Physics 2
12.3 Magnetism and Current-Carrying Wires
12.1 Magnetic Fields
IntermediateMCQMathematicalConceptual16.7k
Two coaxial current loops carrying opposite currents and three points along their common axis.
Two coaxial current loops carrying opposite currents and three points along their common axis.
Two identical circular wire loops, Loop 1 and Loop 2, each of radius \(R\), are fixed parallel to each other along a common central axis (the \(x\)-axis) separated by a distance \(2R\). Loop 1 carries a steady current \(I\) in the clockwise direction when viewed from the positive \(x\)-axis, while Loop 2 carries an equal steady current \(I\) in the counterclockwise direction. Three points along the central axis are identified:

• Point \(P_1\) is at the center of Loop 1.
• Point \(P_2\) is at the midpoint between the two loops.
• Point \(P_3\) is located on the axis a distance \(2R\) to the right of Loop 2.

Which of the following correctly ranks the magnitude of the net magnetic field \(B\) at points \(P_1\), \(P_2\), and \(P_3\)?

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