Solve this:

6. Electric charges having some magnitude of electric charge 'q' coulombs are placed at x=1 m, 2 m, 4 m, 8m..... so on. If any two consecutive charges have opposite sign but the first charge is necessarily positive, what will be the potential at x=0 ?


$$\begin{gathered} \left(1\right) \mathrm{Infinity} \left(2\right) \mathrm{Zero} \\ \left(3\right) \frac{1}{4{\mathrm{\pi \epsilon }}_0}\left(\frac{2\mathrm{q}}{3}\right) \left(4\right) \frac{1}{4{\mathrm{\pi \epsilon }}_0}\left(2\mathrm{q}\right) \end{gathered}$$