Two electric charges \(q\) and \(- 2q\) are placed at \(\left( {0,0} \right)\) and \(\left( {6,0} \right)\) on the \(x - y\) plane. The equation of the zero equipotential curve in the x-y plane is

• A. \(x = - 2\)
• B. \(y = 2\;\)
• C. \({x^2} + {y^2} = 2\;\)
• D. \({\left( {x + 2} \right)^2} + {y^2} = 16\)