How did Thomson know the charge of the particle he discovered was negative?

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asked Oct 15, 2019 224k views

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Enbr · Answer 1 · 2019-10-20T21:30:30+0000

Electrons are very light, even in comparison to protons. Thomson noticed that cathode rays had particles too light, so it was deemed negative by its properties.

How did Thomson know the charge of the particle he discovered was negative?

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