In the last edition of ‘Icons of Electrical Engineering’ we met Richard Feynman (See Vonk 37-3). Among other things, he is famous for the creation of ‘The Feynman Lectures on Physics’ which are commonly used to lecture students on a wide variety of physics subjects including electrodynamics. As you all (will/should become to) know, electrodynamics can be described by the four Maxwell equations. However, James Clerk Maxwell derived a total of 20 equations with 20 unknowns to describe this part of physics. ...