An Eel by the Tail

Mr. Tedder was quite sure that a strip tease dancer had no place in his physics classroom. But what bothered him more was how she got there!
The strip teaser materialized in the first period physics class at Terre Haute's Technical High School.
It all happened just because Mr. Tedder was fresh out of college, and anxious to make good in his first teaching job. He'd been given Physics II, a tough class for a new teacher. His pupils, a set of hardened II-A boys, were sure of themselves and so were the few girls in the class. It was with hopes of shaking that assurance that Mr. Tedder had spent a month of after-school hours studying an article on Ziegler's effect. He also hoped, but with less faith than wistfulness, that a demonstration of Ziegler's effect might shock his class into staying awake. Above all, Mr. Tedder felt that his Junior boys might be considerably edified by an electrical phenomenon that was not yet understood by the best physical theorists of three planets.
Mr. Tedder wanted to give his class a good show. So, with more feeling for dramatic effect than for scientific good sense, he'd wound the three solenoids with heavy insulated silver wire rather than with the light copper wire Ziegler had reported using. On the theory that, if he were to demonstrate the Ziegler effect it would be best to demonstrate a whole lot of it, Mr. Tedder contrived a battery of the new lithium-reaction cells. The direct current from this powerful battery was transformed by an antique, but workable, automotive spark coil.
The bell rang as usual that morning, marking the beginning of the first class. Twenty pupils filed into the physics classroom and took their seats. Eighteen of them slumped down in an attitude which suggested that, although they were prepared to accept stoically the hour's ordeal, they weren't going to allow themselves to be taught anything. After all, Tech had lost last night's game to Walbash: what physical phenomenon could hope to shake off that grim memory? There was a shuffling of papers as the boys in the back seats pulled comic books from their notebooks. Guenther and Stetzel, sitting up front, pulled sheets of paper from notepads and headed them, The Ziegler Effect.