If V(x,y) is the voltage or potential at a point (x,y) in a region V of the xy-plane, then the level curves of V are called equipotential curves. Along such a curve, the voltage remains constant. Given that:

V(x,y) = 10/sqrt(9 + x²+ y²). Sketch the equipotential curves at which V= 2.0; V= 1.0; & V= 1.25