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AP Physics 2
12.4 Electromagnetic Induction and Faraday’s Law
IntermediateMCQMathematical16.6k
A top-down schematic view of a rectangular conducting track system in the horizontal plane. A U-shaped conducting rail consists of two parallel horizontal rails running left-to-right, connected at the far left by a vertical segment containing a resistor labeled R. A vertical straight conducting rod of length L spans between the upper and lower rails, positioned near the middle of the track. An arrow labeled v points to the right from the midpoint of the rod. Uniform magnetic field vectors represented by evenly spaced cross symbols (x) in a 4 by 4 grid cover the interior region between the rails, labeled with a field vector symbol B pointing into the page. No other labels, lines, text, or axes appear.
Conducting rod moving on horizontal rails in a uniform magnetic field.
A conducting rod of length \(L\) moves to the right at a constant speed \(v\) along frictionless, parallel horizontal conducting rails connected by a resistor of resistance \(R\). The track and rod system is located in a uniform magnetic field of magnitude \(B\) directed perpendicularly into the plane of the rails, as shown in the diagram. The resistance of the rod and rails is negligible. Which of the following expressions represents the rate at which thermal energy is dissipated in the resistor?

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