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Fac = Fbc
(k.Ma.Mc)/(Rac)^2 = (k.Mb.Mc)/(Rbc)^2
Ma/(Rac)^2 = Mb/(Rbc)^2
(Rbc/Rac)^2 = (Mb/Ma)
(1/2)^2 = (Mb/18.10^-9)
Mb = 18.10^-9/(4)
Mb = 4,5.10^-9 coloumb.
jadi, muatan di titik B adalah 4,5.10^-9 C.