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AP Physics C: E&M
13.3 Induced Currents and Magnetic Forces
13.2 Electromagnetic Induction
13.1 Magnetic Flux
AdvancedMCQGraphicalMathematicalConceptual18.5k
A line drawing in oblique perspective showing two parallel conducting rails inclined at an angle \(\theta\) to the horizontal, separated by a distance \(\ell\). At the elevated upper ends, the rails are connected by a rectangular resistor labeled \(R\). A straight conducting bar of mass \(m\) and length \(\ell\) rests horizontally across the two rails. A dashed horizontal reference line extends from the bottom of the incline, with an arc indicating the incline angle \(\theta\). Five vertical upward-pointing arrows represent the uniform magnetic field, with one arrow labeled \(\vec{B}\). No other labels, lines, text, or axes appear.
Conducting bar on inclined rails in a uniform vertical magnetic field.
Two parallel, frictionless conducting rails separated by a distance \(\ell\) are inclined at an angle \(\theta\) above the horizontal and connected at the top by a resistor of resistance \(R\). A uniform, vertically upward magnetic field of magnitude \(B\) exists throughout the region. A conducting bar of mass \(m\) and length \(\ell\) is released from rest on the rails at time \(t = 0\). Which of the following graphs best represents the speed \(v\) of the bar as a function of time \(t\)?

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