A charge +q is fixed at each of the points x=x0, x=3x0, x=5x0 ......∞ on the x-axis and a charge -q is fixed at each points x=2x0, x=4x0, x=6x0, ........ Here x0 is a positive quantity. The potential at origin due to above system of charges is
-
UP 0 DOWN 0 0 0
