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AP Physics C: E&M
12.2 Magnetism and Moving Charges
IntermediateMCQMathematicalConceptual23k
Schematic diagram of a velocity selector and deflection chamber for charged ions.
Schematic diagram of a velocity selector and deflection chamber for charged ions.
A beam of singly ionized atoms with charge \(+e\) enters a velocity selector consisting of a uniform downward electric field of magnitude \(E\) and a uniform magnetic field of magnitude \(B_1\) directed into the page. Ions that travel undeflected emerge through a narrow aperture into a separation chamber containing a uniform magnetic field of magnitude \(B_2\) directed into the page. Inside the separation chamber, the ions follow semicircular paths of radius \(R\) before colliding with a detector. In terms of the given quantities, what is the mass \(m\) of the detected ions?

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