Exercise E1 Magnetic Field Lines
(written test, approx. 4 % of a 120-minute written test, SS2021) 
Several parallel conductors are projecting out of the plane. 
The same current $|I|$ flows through all the conductors in different directions (see image below). 
Sketch at least 10 field lines of the magnetic field strength $\vec{H}$ in such a way that the different properties of the field lines (e.g. direction and density) can be seen. 
- high density of field lines near the conductors
 - direction of the field lines given by the right-hand rule
 - magnetic field has closed field lines
 - resulting field given by superposition of field lines