(Solution) - Two electrically charged pith balls each having mass M are -(2025 Original AI-Free Solution)

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Two electrically charged pith balls, each having mass M, are suspended from light threads of equal length. Determine the resultant horizontal force of repulsion, F, acting on each ball if the measured distance between them is r.
Given:
M = 0.2 gm
r = 200 mm
l = 150 mm
d = 50 mm