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A velocity selector uses crossed electric and magnetic fields so that particles pass undeflected when

  • A.their speed equals the ratio of the electric to the magnetic field
  • B.their speed equals the product of the two field magnitudes
  • C.their charge to mass ratio takes a particular value
  • D.their kinetic energy equals the work done by the electric field

Answer: A

Balancing \( QE \) against \( QvB \) gives a speed of \( E/B \) that is independent of both charge and mass, so the arrangement selects by velocity alone. Combining it with a mass spectrometer stage then separates by mass unambiguously.

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