# Cut of magnetic circuit: about (1)

## Context

A cut of magnetic circuit is introduced in a model when there is a need to solve an electric connectivity problem (in 3D).

## Connectivity problem

Connectivity problem:

The coupling between the different potentials (formulations) is sometimes forbidden in the sense that the hypotheses allowing this coupling are no longer valid.

We are talking about magnetic connectivity problem in case of a closed magnetic circuit with non-simply connected objects (see following blocks).

## Notion of connected space

## Concept of cut

## Magnetic connectivity problem