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AP Physics C: E&M
13.1 Magnetic Flux
BeginnerMCQMathematical14.3k
Cross section of the solenoid and three concentric wire loops.
Cross section of the solenoid and three concentric wire loops.
A long ideal solenoid of radius \(R\) carries a constant current, producing a uniform magnetic field \(B\) directed along its central axis inside the solenoid, while the magnetic field outside the solenoid is negligible. Three flat, circular, concentric wire loops—Loop 1 with radius \(r_1 = 0.5R\), Loop 2 with radius \(r_2 = 1.5R\), and Loop 3 with radius \(r_3 = 2.5R\)—are placed in a plane perpendicular to the central axis of the solenoid. Which of the following correctly ranks the magnetic fluxes \(\Phi_1\), \(\Phi_2\), and \(\Phi_3\) through Loop 1, Loop 2, and Loop 3, respectively?

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