Question

Um corpo possui 5,0x10 19 protons e 4,0x10 19 eletrons. Considerando a carga elementar e=1,6x10-19, qual a carga deste corpo?

Answer 1

$p^{+}=1,6.10^{-19}\\ e^{-}=-1,6.10^{-19}\\ n_{e^{-}}=4.10^{19}\\ n_{p^{+}}=5.10^{19}\\\\ Q_{e^{-}}=4.10^{19}.-1,6.10^{-19}C\implies Q_{e^{-}} =-6,4C\\ Q_{p^{+}}=5.10^{19}.1,6.10^{-19}C \implies Q_{p^{+}}=8C\\ \\Q_{T}=Q_{e^{-}}+Q_{p^{+}}\implies Q_{T}=-6,4C+8C\\Q_{T}=1,6C$
A carga do corpo será de 1,6C (coulombs)