The 3 charges ( frac {q}{2} ), -q, ( frac {q}{2} ) are placed along the x axis at x = 0, x = r, x = 2 respectively. Find the resultant potential at a point A located at a distance y from charge q such that r << y.

• A. V= ( frac {4qr^2}{4 pi varepsilon_o y} )
• B. V= ( frac {qr^3}{4 pi varepsilon_o y^3} )
• C. V= ( frac {qr^2}{4 pi varepsilon_o y^3} )
• D. V= ( frac {qr^3}{4 pi varepsilon_o y^2} )