Question

Two charged particles having charge $2.0\times {10}^{-8}C$ each are joined by an insulating string of length 1 ma nd the system is kept on a smooth horizontal table. Find he tension in the string.
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Answer 1

Force between the charge particle
= tension of string
$T=\frac{9\times {10}^9\times (2.0\times {10}^{-8}{)}^2}{1^2}=3.6\times {10}^{-5}N$