The Background Magnetic Flux Density node adds a boundary condition for the magnetic vector potential:

where Ab is defined to satisfy:

where Bb is defined in the Magnetic Flux Density section.

As the equation suggests, the boundary condition only guarantees that the tangential components of A and Ab are equal. Their normal components might deviate depending on specific situations. The Background Magnetic Flux Density node is incompatible with the Periodic Condition node. If periodicity is required in a background field, use the Magnetic Potential node along with the Periodic Condition node, and ensure that appropriate values are set consistently.

Enter a value or expression for the Magnetic flux density Bb (SI unit: T) components.

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