Physics - Electrostatics Question with Solution | TestHub

Two uniformly charged co-axial, identical rings (Radius R ) are fixed as shown. A point charge ${\mathrm{q}}_0$ is projected with speed ${\mathrm{V}}_0$ along common axis of rings from large distance. Minimum value of ${\mathrm{V}}_0$ for which the charge particle can just pass through both rings is given as ${\mathrm{V}}_0=\sqrt{\frac{\mathrm{kq}{\mathrm{q}}_0}{\mathrm{nmR}}}$ find n. $\left(\mathrm{k}=\frac{1}{4\pi {ϵ}_0}\right)$