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jarak = r
Gaya = F
ditanyakn berapa F jika r diubah 2 kali jarak semula ?
Dijawab :
F = k Q1 Q2/r²
Maka :
F2/F1 = k Q1 Q2/r2² / k Q1 Q2/r1²
F2/F1 = 1/r2² / 1/r²
F2/F1 = 1/4r² / 1/r²
F2 = 1/4r² / 1/r² x F1
F2 = 4 F1
jadi F2 = 1/4 F1