what is the value of charge to mass ratio of electron
Mass-to-charge ratio 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 ​e⁄me = - 7011175882002400000♠1.758820024(11)×1011 C/kg.[2]