Question
Two charged particles having charge $2.0 × 10^{-8}$C each are joined by an insulating string of length 1m and the system is kept on a smooth horizontal table. Find the tension in the string.
✓
Answer
Force exerted $=\frac{\text{kq}_1^2}{\text{r}^2}$
$=\frac{9\times10^9\times2\times2\times10^{-16}}{1^2}$
$=3.6\times10^{-6}$ Is the force exerted on the string.
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