# An infinite number of charges each numerically equal to q and of the same sign are placed along the x-axis at $\;x=1 ,2 ,4 ,8----\;.$ Find elctric potential at $\;x=0$

$(a)\;k\;q\qquad(b)\;2 k\;q\qquad(c)\;4 k\;q\qquad(d)\;\large\frac{k\;q}{2}$

Answer : (b) $\;2 k\;q$