The Gap Feed subnode is available from the context menu (right-click the Single-Turn Coil parent node) or from the Physics toolbar, Attributes menu for 3D components (at the domain level). Gap Feed is used to excite the coil from an internal boundary. It applies a discontinuity in the coil potential across a boundary to enforce a potential difference or a prescribed current. This feature must be applied to an internal boundary in the coil domain, and is typically used to excite a closed loop.

See Single-Turn Coil for all settings.

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