Why did Thomson choose electric current only and also electrons were already discovered during the flow of electricity.why didn't Thomson choose any other rays or any thing to conduct the canal ray experiment.

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Solution

Thomson set out to prove that the cathode rays produced from the cathode were actually a stream of negatively charged particles called electrons. So when using current he can only show the negatively charged particles .When use other rays he cannot find negatively charged particles.So to find negatively charged particles he used electricity and does not use any other rays.

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