In a mass spectrometer, an ion of charge, q, and mass, m, moving in a path of radius, r, in a field of flux density, B, has a speed of

a

\(\frac{qBr}{m}\)

b

\(\frac{mr}{qB}\)

c

\(\frac{qm}{Br}\)

d

\(\frac{mq}{r}\)

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