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If V(x, y) is the electric potential at a point (x, y) in the xy-plane, then the level curves of V are called equipotential curves because at all points on such a curve the electric potential is the same. Identify the shape of these curves for the function below, where c and r are positive constants.

V(x,y) = C/sqrt(r^2 - x^2 - y^2)

 

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