In Thomson's method for determining the $e/m$ ratio of an electron,which of the following conditions is true regarding the fields?

  • A
    The electric field and magnetic field are parallel to each other and to the electron beam.
  • B
    The electric field and magnetic field are perpendicular to each other and both are perpendicular to the electron beam.
  • C
    The magnetic field is perpendicular to the electron beam.
  • D
    The electric field is parallel to the electron beam.

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