Using a cathode ray tube, J. J. Thomson determined the magnitude of the electric charge on the electron.

Name: Using a cathode ray tube, J. J. Thomson determined the magnitude of the electric charge on the electron.
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J. J. Thomson determined the charge-to-mass ratio of the electron using a cathode ray tube, not the magnitude of the electric charge. The magnitude of the electric charge on the electron was later determined by Robert A. Millikan through the oil-drop experiment.

Using a Cathode Ray Tube, J