Question

Two charged particles having charge $2.0\times {10}^{-8}C$ 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 1

Given,

$q=2\times {10}^{-8}C$

$r=1m$

$\frac{1}{4\pi {\epsilon }_0}=8.99\times {10}^9$

Coulomb's law,

$F=\frac{q^2}{4\pi {\epsilon }_0{r}^2}$

$F=\frac{8.99\times {10}^9\times 2\times {10}^{-8}\times 2\times {10}^{-8}}{(1{)}^2}$

$F=3.596\times {10}^{-6}N$

The tension is string is $3.596\times {10}^{-6}N$