The values of charge on the oil droplets experimentally observed were - 1 . 6 × 10 - 19 , - 2 . 4 × 10 - 19 and - 4 × 10 - 19 coulombs . The value of the electronic charge (in coulombs ) indicated by these results is

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In oil droplets experiment the relationship between the magnitude of charge on the oil drop ( Q ) and the charge on the electron ( e ) is Q = ne where n   is a natural number which indicates the number of excess electrons added on an oil drop (or sometimes the number of electrons knocked out of the drop). As, e = Q n = - 1 . 6 × 10 - 19 n ' = - 2 . 4 × 10 - 19 n '' = - 4 . 0 × 10 - 19 n ''' . For n ' ,   n '' and n ''' to have natural number v