Who discovered the charge on electron?

  1. J.J. Thomson
  2. James Chadwick
  3. Robert Millikan
  4. None of these

Answer (Detailed Solution Below)

Option 3 : Robert Millikan
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Detailed Solution

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CONCEPT:

Millikan's oil drop experiment:

  • In 1909, Robert A. Millikan and Harvey Fletcher conducted Millikan's Oil Drop Experiment to determine the charge of an electron.
  • Millikan created an electric field by allowing charged tiny oil droplets to move through a hole.
  • The charge over an oil droplet was determined by varying the strength of the electric field, which always came as an integral value of ‘e'.


⇒ e = 1.6 × 10-19 C

EXPLANATION:

  • In 1909, Robert A. Millikan and Harvey Fletcher conducted Millikan's Oil Drop Experiment to determine the charge of an electron. Hence, option 3 is correct.

Additional Information

Particle Discovered By Year
Neutron James Chadwick 1932
Electron J.J. Thomson 1897
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