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AP Physics 2
12.4 Electromagnetic Induction and Faraday’s Law
AdvancedMCQMathematicalProportional Analysis25.1k
A two-panel schematic diagram illustrating two circular loops in magnetic fields. On the left, labeled Loop 1, a circular wire loop of radius r lies flat in a plane perpendicular to vertical upward magnetic field lines labeled B1. An arrow labeled A1 representing the loop area normal vector points vertically upward, parallel to B1 at an angle of 0 degrees. On the right, labeled Loop 2, a larger circular wire loop of radius 3r is tilted relative to vertical upward magnetic field lines labeled B2. An arrow labeled A2 representing its surface normal vector points up and to the right, forming an angle of 60 degrees with the vertical field lines B2. No other labels, lines, text, or axes appear.
Two circular loops positioned in changing magnetic fields.
A flat, circular loop of radius \(r\) is placed in a uniform magnetic field such that the plane of the loop is perpendicular to the field lines. The magnetic field magnitude increases at a constant rate \(\left|\dfrac{\Delta B}{\Delta t}\right| = C\), inducing an electromotive force of magnitude \(\mathcal{E}_1\) in the loop. A second flat, circular loop has a radius of \(3r\) and is placed in a different uniform magnetic field whose magnitude increases at a constant rate \(\left|\dfrac{\Delta B}{\Delta t}\right| = 4C\). The second loop is oriented such that the normal to its plane makes an angle of \(60^\circ\) with the magnetic field lines. What is the ratio of the magnitude of the induced electromotive force in the second loop to that in the first loop, \(\dfrac{\mathcal{E}_2}{\mathcal{E}_1}\)?

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