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muatan 1 Q1
muatan 2 Q2
jarak R
Ditanya gaya akhir Ft saat R diubah 1/2R
F = k.Q1.Q2./ R²
Fo = kQ1.Q2/R²
---------------------- ---> K Q1 Q2 boleh dicoret dikedua ruas
Ft = kQ1.Q2/(1/2R)²
Fo = 1/R²
------------- ----> coret R
Ft = 1/4R²
Fo = 4
---------
Ft = 1
Fo = 4Ft
Ft = 1/4 Fo
Gaya listrik akhir seperempat gaya awal