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AP Physics 2
12.3 Magnetism and Current-Carrying Wires
AdvancedMCQMathematicalConceptual24.6k
A schematic showing three planar current-carrying wire loops placed side by side in a region containing a uniform magnetic field. On the left is a circular loop labeled with surface area A and a clockwise current arrow I. In the center is a square loop labeled with surface area A and a clockwise current arrow I. On the right is an equilateral triangular loop labeled with surface area A and a clockwise current arrow I. Five parallel horizontal arrows pointing to the right span the background, labeled B to represent a uniform magnetic field. No other labels, lines, text, or axes appear.
Three wire loops of equal area A carrying current I in a uniform magnetic field B.
Three flat, single-turn wire loops—one circular, one square, and one equilateral triangular—are placed in a uniform magnetic field \(\vec{B}\). Each loop encloses the exact same surface area \(A\) and carries the same steady electric current \(I\). Which of the following correctly ranks the maximum magnetic torque \(\tau_{\text{max}}\vec{}\) exerted on each loop as its orientation in the field is varied?

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