Physics - Electrostatics Question with Solution | TestHub

A positive charge ' ${\mathrm{Q}}_1$ ' is held fixed. Another positive charge particle of charge ${\mathrm{Q}}_2$ and mass ' m ' is thrown with velocity ' v ' towards ${\mathrm{Q}}_1$ from very large distance. If minimum distance between them is ${\mathrm{r}}_0$, then v is given by $\sqrt{\frac{{\mathrm{Q}}_1{\mathrm{Q}}_2}{\eta \pi {ϵ}_0{\mathrm{mr}}_0}}$. Find the value of $\eta$.