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In this episode Shahriar re-traces history and measures an important characteristics of a fundamental sub-atomic particle: the charge to mass ratio of an electron. This experiment, first performed in 1897 by J.J. Thomson, changed physics by showing that atoms are indeed made of further sub-atomic particles through the discovery of electrons. We build a setup using a pair of Helmholtz coils, a cold-cathode vacuum tube driven by a multi-kV DC power supply & careful measurements of the beam deflection angle. The theoretical foundation of the experiment is described in details. The measured e/m ratio is compared with the NIST established number with great agreement. The historical impact of the work of J.J Thomson & Robert Milikan (measuring the charge of an electron) are also presented. The two winners of the giveaway are: @nicolasblomstrand2912 (YouTube) Robert S. (Patreon) Each will receive a Siglent SDS1104X HD! https://www.siglentna.com/product/sds... Please consider supporting The Signal Path: https://www.TheSignalPath.com/Donate   / thesignalpath   Other links: https://www.TheSignalPath.com   / thesignalpath