Charge of electron was measured by__________________?
Correct answer: B. Millikan
- A. J.J Thomson
- B. Millikan
- C. Rutherford
- D. Perrin
Explanation
Millikan measured the magnitude of the electron’s charge using the oil-drop experiment by balancing electrical force against gravitational force on charged droplets. J. J. Thomson measured the charge-to-mass ratio of the electron, not its charge alone. Students commonly choose Thomson because he discovered the electron and determined its e/m ratio.
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About Discovery of the Proton
The discovery of the proton follows the study of positive rays, also called canal rays, observed in discharge tubes and later identified as positively charged particles. The work of Goldstein and Rutherford is linked to the proton's charge, relative mass and role in the nuclear model, distinct from the discovery of the electron.
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