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[tex]

\mathbf A=\frac{\mu_0}{4\pi}\int_{V'}\frac{\mathbf J}{R}dv'

[/tex]

But when I do the integral, it doesn't converge. However, if I calculate [itex]\nabla\times\mathbf A[/itex], i.e. move the [itex]\nabla\times[/itex] inside the integral, it works out fine. Is it really impossible to calculate [itex]\mathbf A[/itex] for an infinite current sheet? I have the same problem if I try to calculate the potential [itex]V[/itex] of an infinite sheet of charge, but for the electric field [itex]\mathbf E[/itex] it works out fine.