Questions about background reduced field in COMSOL Magnetic field module?

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In the frequency domain research mode of COMSOL, we want to apply an AC magnetic field superimposed by a DC magnetic field, in which the AC field is applied through the coil. Can we regard it as a DC magnetic field by setting the background reduced field to a constant(In the two-dimensional axisymmetric model, the background field is set as the axial uniform magnetic flux density and is a constant) ? Or is the background reduced field a DC magnetic field or an AC magnetic field in the frequency domain? Thanks!


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