Over 200 years ago, it was discovered that a magnetic field appears around a wire when an electric current runs through it. Since then, electromagnetism has been generalized and now forms the scientific foundation for many of the technologies of our time, ranging from wind turbines to telecommunication. Today, stateof-the-art apparatuses, such as scanning tunneling microscopy break junctions and mechanically controllable break junctions, enable researchers to measure current passing through a single molecule trapped between two metal electrodes. Such experiments provide both insight into the electronic nature of molecules, and form the basis for molecular electronic devices which may one day enable a new generation of functional electronics. An electric current that passes through a molecule is similar to that of a macroscopic wire, in the sense that the flow of electrons will generate a magnetic field around the wire. Naturally, the magnetic field resulting from current passing through a molecular wire will often be weak due to the low bias that can be applied to molecular junctions. Such magnetic fields are potentially in the µT range, which is smaller than Earth's magnetic field at its surface (Table ). However, if suitable molecules can be identified, it may be possible to achieve substantial magnetic fields. Ideally, this should be in the tesla-range that is achieved in modern electromagnets (Table ). It is the goal of this study to identify such molecules, and provide molecular design rules for achieving this. When a unidirectional electric current passes through a molecule, a circular magnetic field will form around the molecular wire in accordance with the right-hand rule. The anilineterminated diyne in Figure is an example of a molecule with a current density that is largely linear through the polyynic segment of the molecule. The resulting magnetic field is consequently circular around the diyne, as the right-hand rule dictates (Figure ).