<P> The mass - to - charge ratio (m / Q) is a physical quantity that is most widely used in the electrodynamics of charged particles, e.g. in electron optics and ion optics . It appears in the scientific fields of electron microscopy, cathode ray tubes, accelerator physics, nuclear physics, Auger electron spectroscopy, cosmology and mass spectrometry . The importance of the mass - to - charge ratio, according to classical electrodynamics, is that two particles with the same mass - to - charge ratio move in the same path in a vacuum when subjected to the same electric and magnetic fields . Its SI units are kg / C. In rare occasions the thomson has been used as its unit in the field of mass spectrometry . </P> <P> Some fields use the charge - to - mass ratio (Q / m) instead, which is the multiplicative inverse of the mass - to - charge ratio . The 2014 CODATA recommended value for an electron is ⁄ = - 7011175882002400000 ♠ 1.758 820 024 (11) × 10 C / kg . </P> <P> When charged particles move in electric and magnetic fields the following two laws apply: </P>

Formula to find the mass of an electron
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