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~~#@ee1_taskctr~~ Magnetic Field Lines \\
<fs medium>(written test, approx. 6 % of a 120-minute written test, SS2024)</fs> 
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The following setup shall be given:
  * Four conductors are located perpendicular to the plane of the diagram
  * All of them conduct a current with the same magnitude, but not in the same direction.
  * A permanent magnet is located in between the conductors.

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1. Do not consider the permanent magnet at first. Draw at least 10 field lines of the H-field qualitatively. 
Give a a correct representation of their direction, and density for the shown area.


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2. Discuss how the permanent magnet affects the H-field, based on the fundamental definition of the H-field.

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  * The H-field is defined by currents $\sum I = \int H {\rm d}s$ . 
  * In the permanent magnet, there are no free currents. 
  * The bound currents (of the permanent magnet) create also an H field.
  * This exits on the north pole and enters the magnet on the south pole (similar to the B-field)_
  * $H = B/\mu$
  * The H-field from task 1 gets distracted

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