Exercise:
Zeichnen Sie für die folgen Situationen das Magnetfeld ein. Sofern möglich sollten die Richtung erkennbar sein. multicols enumerate item Stabmagnet:.cm tikzpicturescale. draw thick rectangle ; node at N; node at S; tikzpicture vspace.cm item Hufeisenmagnet:.cm tikzpicturescale. draw thick -- -- -- -- -- -- -- -- ; node at N; node at S; tikzpicture vspace.cm item Langer gerader Draht:mm tikzpicturescale. draw thick dashed -.-. -- ; draw thick -- ; draw thick dashed -- ..; draw thick dashed -- -- -..; draw thick -.. -- ..; draw thick dashed .. -- ; draw thick -latex .. -- node aboveyshift vec I..; tikzpicture vspace.cm item Einfache kreisförmige Spule:mm tikzpicturescale. drawvery thick ellipse and ; draw -- -- . -- . -- ; drawthick fillblack . ellipse mm and mm; drawthick fillblack . ellipse mm and mm; drawline widthmm drawwhite . -- ..; drawline widthmm drawwhite . -- . -- . -- .. -- ..; tikzpicture enumerate multicols

Solution:
multicols enumerate item Stabmagnet:mm tikzpicturescale. draw thick rectangle ; node at N; node at S; % draw very thick . arc ::.; draw very thick-latex . -- ..; draw very thick .. -- .; draw very thick . arc :-:.; % -- draw very thick -. arc ::.; draw very thick-latex -. -- .-.; draw very thick .-. -- -.; draw very thick -. arc -::.; % -- draw very thick .-. arc ::.+.; draw very thick-latex .+. -- ..+.; draw very thick ..+. -- .+.; draw very thick .+. arc :-:.+.; % -- draw very thick -.+. arc ::.+.; draw very thick-latex -.-. -- .-.-.; draw very thick .-.-. -- -.-.; draw very thick -.-. arc -::.+.; % -- draw very thick-latex -- -.; draw very thick -. -- -; draw very thick -- ; draw very thick latex- . -- ; tikzpicture item Hufeisenmagnet:mm tikzpicturescale. draw thick -- -- -- -- -- -- -- -- ; node at N; node at S; % foreach y in ... draw very thick-latex y -- .y; draw very thick y -- y; draw very thick -latex arc ::cm; draw very thick . arc ::cm; % -- draw very thick -latex . arc ::.cm; draw very thick .. arc ::.cm; % -- draw very thick -latex -. arc ::.cm; draw very thick . arc ::.cm; tikzpicture item Langer gerader Draht: tikzpicturescale.latexdecorationmarkings markat position . with arrow draw thick dashed -.-. -- ; draw thick -- ; draw thick dashed -- ..; draw thick dashed -- -- -..; draw thick -.. -- ..; draw thick dashed .. -- ; draw thick -latex .. -- node aboveyshiftxshift-mm vec I..; % foreach x in ... draw very thickpostactiondecorate -.+x*..+x*. ellipse mm and mm; tikzpicture item Einfache kreisförmige Spule:mm tikzpicturescale.latex drawvery thick ellipse and ; draw -- -- . -- . -- ; drawthick fillblack . ellipse mm and mm; drawthick fillblack . ellipse mm and mm; drawline widthmm drawwhite . -- ..; drawline widthmm drawwhite . -- . -- . -- .. -- ..; % drawvery thickdecorationmarkingsmarkat position -. with arrowpostactiondecorate . ellipse mm and mm; drawvery thickdecorationmarkingsmarkat position . with arrowpostactiondecorate . ellipse mm and mm; drawvery thicklatex- . arc ::.cm; drawvery thicklatex- . arc ::.cm; tikzpicture enumerate multicols