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I want to find the magnetic field result from DC current flow through the rectangular transmission line numerically by using the finite difference.

the solved equation is curl curl A =ยต J , with div A=0, and J is a uniform current on the crosssection.

I implement the matlab code , but the result is not logical, so i think the boundary condition is the problem

I take the symmetry plans , one vertical and other Horzi. and solve the problem for quarter conductor.

my question the boundary conditions for that problem

thank you in advance

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# Magnetic field inside and outside the rectangular conductor

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