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AP Physics 2
12.2 Magnetism and Moving Charges
AdvancedMCQMathematicalConceptual20.6k
A schematic diagram showing two horizontal parallel conducting plates. The upper plate is at a higher electric potential than the lower plate. Uniform vertical arrows between the plates point downward and are labeled E. An array of uniform cross symbols distributed between the plates represents a magnetic field labeled B directed into the page. A particle labeled +q enters horizontally from the left along the central line with a velocity arrow pointing to the right labeled v. No other labels, lines, text, or axes appear.
Velocity selector setup with crossed electric and magnetic fields.
A velocity selector consists of two horizontal parallel conducting plates producing a uniform downward electric field of magnitude \(E\), and a uniform magnetic field of magnitude \(B\) directed into the page throughout the region between the plates. Positively charged ions of charge \(+q\) enter the region horizontally to the right with speed \(v\). If the ions enter with a speed \(v > \dfrac{E}{B}\), towards which plate do the ions deflect, and how does their kinetic energy change while in the region between the plates?

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