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AP Physics 2
12.2 Magnetism and Moving Charges
IntermediateMCQMathematicalConceptual15k
A schematic of a velocity selector. Two horizontal parallel plates are separated vertically. The top plate is positively charged and the bottom plate is negatively charged, producing a uniform vertical electric field E directed downward. A uniform magnetic field B directed into the page is represented by a grid of small x symbols between the plates. A central dashed horizontal line indicates the straight path along the x-axis. A positively charged particle with charge +q enters from the left moving horizontally to the right with velocity v. No other labels, lines, text, or axes appear.
Velocity selector with crossed electric and magnetic fields.
A velocity selector consists of two horizontal parallel plates that produce a uniform electric field \(\vec{E}\) directed downward, and a uniform magnetic field \(\vec{B}\) directed into the page throughout the region between the plates. A particle with positive charge \(+q\) and mass \(m\) moving horizontally to the right with speed \(v_0 = E/B\) passes undeflected along a straight horizontal path of length \(L\). Two additional identical positively charged particles, particle 1 and particle 3, enter the selector horizontally to the right at the same initial height with speeds \(v_1 = 0.5 v_0\) and \(v_3 = 1.5 v_0\), respectively. Which of the following correctly identifies the direction of deflection for particle 3 and compares the magnitude of vertical deflection \(|y_1|\) of particle 1 to \(|y_3|\) of particle 3 upon exiting the region?

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