I just created a new podcast about the reisstors exercise #9 in ch. 21 of the problem solving manual. It is in the "Electromagnetism" folder of the iTunes U area.It is extra, above and beyond the concept guide 3A, but I think I will ask a bonus question or two on the final over this topic. It is centered on concepts in the textbook, p. 437 and thereabouts.
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