11. one point, from Lecture 11 and all of Unit 1, involves words and a picture

(a) .2 from Lecture 11, The Nature of Light. How did Maxwell know that light is an electromagnetic wave? (.1)
What combination of electromagnetic constants gives the value of the speed of light? (.1) Be sure you learn that value!

(b) .5 from Lecture 11, Making the Equations more Symmetrical. What is a magnetic monopole? (.1) May it exist? (.1) What does it have to do with the difference between electric and magnetic field lines? (.1)
Describe displacement current in terms of a capacitor. (.1) What two symmetries does the displacement current guarantee? (.2)

(c) .2 from all of Unit 1, Shoulders of Giants. Maxwell illustrates Newton's famous, though probably plagiarized, quote, ``If I have seen further than others, it has been by standing on the shoulders of giants.'' How did his physics depend on the physics of at least two of his predecessors? (.2)

Revised September 22, 1997.