A charge q= 1.11 x 10^9 C is placed at the origin, x = 0, and a second charge equal to -5q is placed on the x axis at the location x = 1.00 m. (a) Find the electric potential at x = 0.500 m. (b) The electric potential vanishes at some point between the charges, for a value fo x between 0 and 1.00 m. Find the value of x.