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The impression might be taken by a naive student that such electron
velocities actually occur in the lightning phenomenon. It is unclear
to me that mentioning lightning at all in this problem has any
justification whatever. It is an example of gratuitous sex - trying
to make the problem "more interesting" or, in ancient language,
"relevant". (That is the most common reason for including skin shots
in modern movies. They aren't essential to the story, but they put
bottoms into theater seats.) The author is misguided in doing so;
only misconception can result from this excess.
Leigh