Answers

2014-06-05T16:36:28+05:30
F = kq1q2 / tr²     (let t = relative permitivity)(k = 9*10^9)
for vacuum t = 1
F1 = kq1q2 / r²
F2 = kq1q2 / 16R²
F1/F2 = 16R²/r²
R = r / 4
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