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Re: EM Induction - A conceptual question



thanx - that was my memory of things.



At 1:15 PM -0400 on 4/17/02, Carl E. Mungan wrote
> >Chuck Britton wrote:

I choose an amperian loop to be a rectangle, one side within
the field and parallel to the field, opposite side, parallel to the
first but in the field free region, and the two connecting sides at
right angles to the field????

> > How much current passes through this loop? It SEEMS to be a problem!

I did not answer this question earlier, because I assumed you were
teasing us and that that is why "seems" is in capitals. After all,
this is a standard textbook matter - see for example Tipler 4th ed
Vol 2 problem 50 in chapter 29 on page 921, or Giancoli example 28-6.

The answer is that there must be a fringing field. We merely
approximate the field as being uniform in one region and suddenly
dropping to zero in an adjacent region, but of course Maxwell's
boundary conditions don't permit this.

Carl
--
Carl E. Mungan, Asst. Prof. of Physics 410-293-6680 (O) -3729 (F)
U.S. Naval Academy, Stop 9C, Annapolis, MD 21402-5026
mungan@usna.edu http://physics.usna.edu/physics/faculty/mungan/

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