D. ¼F
= F1 r1²
= F1 r1²/r2²
= F . r² / (2r)²
= F . r² /4r²
= F . 1/4
F = k q1.q2/r²
F1/k = k q1.q2/r² / k.q1.q2/r²
F1/k = r²/r¹²
= r²/r⁴
= 1/4 F
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D. ¼F
penjelasan
= F1 r1²
= F1 r1²/r2²
= F . r² / (2r)²
= F . r² /4r²
= F . 1/4
Penyelesaian:
F = k q1.q2/r²
F1/k = k q1.q2/r² / k.q1.q2/r²
F1/k = r²/r¹²
= r²/r⁴
= 1/4 F
D.