The Electrostatics Interface and The Electrostatics, Boundary Elements Interface can also be coupled by using the same name for the dependent variable for both interfaces. Then Electric Scalar-Scalar Potential Coupling is not needed. How to set the name for the dependent variable is described in the Dependent Variables section.
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When using The Electrostatics, Boundary Elements Interface with iterative solvers, Right Preconditioning is preferred. Thus, it is advised to check that Right Preconditioning is used when combining the Electric Scalar-Scalar Potential Coupling with The Electrostatics, Boundary Elements Interface and other physics interfaces. How to define Right Preconditioning is described in Iterative in the COMSOL Multiphysics Reference Manual.
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Select Electrostatics, Boundary Elements as Primary interface and Electrostatics as Secondary interface.
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