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AP Physics 2
12.4 Electromagnetic Induction and Faraday’s Law
IntermediateMCQGraphicalConceptual19.7k
A square wire loop of side length L is positioned vertically above a horizontal rectangular region containing a uniform magnetic field directed into the page, represented by a regular grid of small x symbols. A downward vertical arrow next to the loop is labeled with g to indicate gravitational acceleration. A dashed circular arrow pointing counterclockwise around the loop is labeled with +I to define the positive current direction. Below the magnetic field region, open white space indicates that the loop will continue falling straight through. The vertical height of the magnetic field region is greater than the side length L of the loop. No other labels, lines, text, or axes appear.
A square loop falling vertically through a region of uniform magnetic field.
A square wire loop of side length \(L\) and resistance \(R\) is released from rest above a region of uniform magnetic field directed into the page. The height of the magnetic field region is greater than \(L\), and the magnetic force on the loop is negligible compared to gravity as it falls. Counterclockwise current in the loop is defined as positive. Which of the following best describes the graph of the induced current \(I\) in the loop as a function of time \(t\) as it falls completely through the magnetic field region?

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