Since 1884 Calzecchi had been researching the properties of metal powders, finding high electrical conductivity due to various excitations such as extra current, lightning, electrostatic induction, etc . Calzecchi's experiments with tubes of metal filings led to the development of the first radio wave detector, the coherer, in 1890 by Edouard Branly.
22.
In fact, it's worse with the electron sheet because they repel each other, so can't hold up against even 0 force without assistance ( fortunately, the same rest of the steel is also positively charged and serves to cancel this effect . ) As far as increasing the repulsion, no : in fact, uncharged objects will be " attracted " to a big sheet of electrons ( see electrostatic induction, and think about where the separated charges would go ).
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