In Thomson's method of determining $e/m$ of electrons,how are the electric and magnetic fields arranged relative to the electron beam?

  • A
    Electric and magnetic fields are parallel to the electron beam.
  • B
    Electric and magnetic fields are perpendicular to each other and perpendicular to the electron beam.
  • C
    Magnetic field is parallel to the electron beam.
  • D
    Electric field is parallel to the electron beam.

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