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F1 = k q1 q2 / r1²
F2 = k q1 q2 / r2² ; r2 = (1/2) r1
F2 = k q1 q2 / [(1/2)r1]^4
F2 = k q1 q2 / [(1/4) r1²]
F2 = 4 k q1 q2 / r1²
F2 = 4 F1