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The rainbow truncation of the quark Dyson-Schwinger equation is combined withthe ladder Bethe-Salpeter equation for the dressed quark-photon vertex to studythe low-momentum behavior of the pion electromagnetic form factor. With modelgluon parameters previously fixed by the pion mass and decay constant, the pioncharge radius $r_\pi$ is found to be in excellent agreement with the data. Whenthe often-used Ball-Chiu Ansatz is used to construct the quark-photon vertexdirectly from the quark propagator, less than half of $r_\pi^2$ is generated.The remainder of $r^2_\pi$ is seen to be attributable to the presence of the$\rho$-pole in the solution of the ladder Bethe-Salpeter equation.Comment: 21 pages, 9 figure

Quark-photon vertex and the pion charge radius