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In Thomson's tube, also known as the cathode ray tube, the primary particles involved are electrons. These negatively charged particles are emitted from a cathode and are accelerated towards an anode, creating a stream of electrons, or cathode rays. When subjected to electric or magnetic fields, these electrons can be deflected, allowing for the study of their properties and confirming their charge-to-mass ratio. Thomson's experiments led to the discovery of the electron as a fundamental particle of matter.

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