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AP Physics 2
12.4 Electromagnetic Induction and Faraday’s Law
12.2 Magnetism and Moving Charges
AdvancedMCQMathematicalConceptual19.8k
A vertical schematic showing a square conducting loop of side length L at three sequential positions as it falls vertically downward through a horizontal rectangular band of height 3L containing a uniform magnetic field directed into the page. The magnetic field region is filled with an array of x symbols. At Position 1, the loop's bottom edge is inside the top boundary of the field. At Position 2, the loop is completely inside the field region. At Position 3, the loop's top edge is inside the bottom boundary of the field. A downward arrow labeled v indicates the velocity. No other labels, lines, text, or axes appear.
A square conducting loop falling vertically through a region of uniform magnetic field.
A square conducting loop of mass \(m\), side length \(L\), and resistance \(R\) is released from rest above a horizontal region of uniform magnetic field \(\vec{B}\) directed into the page. The vertical height of the magnetic field region is \(3L\). The loop falls vertically under gravity, passing through three stages: entering the field, moving completely inside the field, and exiting the field. Downward is defined as the positive direction. Which of the following correctly compares the downward acceleration \(a_{\text{exit}}\) of the loop as its top edge exits the field to its downward acceleration \(a_{\text{entry}}\) as its bottom edge enters the field, and provides the correct physical reasoning?

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