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AP Physics C: E&M
12.2 Magnetism and Moving Charges
BeginnerMCQConceptual20.1k
Crossed electric and magnetic fields in a velocity selector.
Crossed electric and magnetic fields in a velocity selector.
A velocity selector consists of a region with a uniform electric field \(\vec{E}\) directed upward and a uniform magnetic field \(\vec{B}\) directed into the page. A beam of positively charged particles enters the selector moving horizontally to the right. Particles with a speed equal to \(v_0 = \dfrac{E}{B}\) pass through the region along a straight horizontal path without being deflected. Which of the following claims correctly describes the path of a positively charged particle entering the region with a speed \(v > v_0\), and provides the correct physical justification?

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