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Fg=Fe
G*M*m/r^2 = k*Q*q/r^2
M=m i Q =q
Gm^2/r^2 = k*q^2/r^2 |*r^2
Gm^2 = kq^2
m=√kq^2/G
m≈√(1.38*10^-23)*(1.6*10^-19)^2/(6.67*10^-11)
m≈√(1.38*10^-23)*(2.56*10^-38)/6.67*10^-11)
m≈√(3.5328*10^-61)/6.67*10^-11)
m≈√5.3*10^-51
m≈7.3*10^-26 [kg]