Respostas

2014-05-30T22:02:43-03:00
Seguindo a Lei de Coulomb. F=k.Q1.Q2/d^2 \\ 202,25.10^-4=9.10^9.Q^2/(0,02)^2 \\ 202,25.10^-4=9.10^9.Q^2/4.10^-4 \\ 202,25.10^-4.4.10^-4=9.10^9.Q^2 \\ 809.10^-8=9.10^9.Q^2 \\ Q^2=809.10^-8/9.10^9 \\ Q^2=9.10^-18 \\ Q=3.10^-9C \\ Q=3 nC