Describe an experiment to measure the ratio of the charge to mass of an electron

Describe an experiment to measure the ratio of the charge to mass of an electron

Describe an experiment to measure the ratio of the charge to mass of an electron

  • The electrons are produced thermionically by a hot filament cathode and are accelerated towards a cylindrical anode and pass through it.
  • The small hole on the anode confines the electrons to a narrow beam.
  • When both the electric field and the magnetic field are off, the electrons reach the screen at X and cause fluorescence.
  • If the velocity of the electrons on emerging from the anode is u then

  • The magnetic field is switched on and the beam is deflected to position Y.
  • In order to bring the beam back to the original position X, the electric field is switched on and adjusted until the beam is at X again.
  • This implies that The magnetic force = the electric force

Beu = eE

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