Schematic image of a cylindrical bar magnet. Southpole colored green with letter S, Northpole colored red with letter N.<br>The image is created by the following python source-code. Requirements:
<ul><li><a href="https://en.wikipedia.org/wiki/Python_(programming_language)" class="extiw" title="en:Python (programming language)">python</a></li>
<li><a rel="nofollow" class="external text" href="https://pypi.python.org/pypi/svgwrite/">svgwrite</a></li></ul>
<a href="//commons.wikimedia.org/wiki/User:Geek3" title="User:Geek3">Geek3</a>
CC BY 3.0
<span class="int-own-work" lang="en">Own work</span>