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Q1= 15 x 10^-19 = 1,5 x 10^-18
Q2= 10 x 10^19 = 10^20
r= 0,2 m = 2 x 10^-1
F= ( k x Q1 x Q2) / r^2
= ( 9x10^9 x 1,5x 10^-18 x 10^20) / (2x10^-1)^2
= (13,5x10^11) / 4x10^-2
= 3,375 x 10^13 N
maap kalo salah._.