Elementary charge and Millikan experiment

Article no. P2510100 | Type: Experiments

45 Minutes
45 Minutes
University
Students
heavy

Benefits

  • Fascination Nobel Prize (Millikan 1923)

  • Exact determination of the elementary electric charge
  • Compact set-up

Learning objectives

  • Electric field
  • Viscosity
  • Stokes' law
  • Droplet method
  • Electron charge

Principle

Charged oil droplets subjected to an electric field and to gravity between the plates of a capacitor are accelerated by application of a voltage. The elementary charge is determined from the velocities in the direction of gravity and in the opposite direction.

Tasks

  1. Measurement of the rise and fall times of oil droplets with various charges at different voltages.
  2. Determination of the radii and the charge of the droplets.

 

 

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