I’m slightly confused by this question. The full quote is: > The effect is negligible in most contexts unless the objects are moving at very high (“relativisti

I’m slightly confused by this question. The full quote is: > The effect is negligible in most contexts unless the objects are moving at very high (“relativistic”) speeds, but electric fields are a notable exception — even though the average drift speed of electrons in a wire usually doesn’t exceed several centimeters per minute. The point of the text you’ve quoted is to set up the seeming contradiction or unexpected idea. Then the hope is that the author explains it in the rest of the article. It is fine to say that the article doesn’t follow through with the implied promise of the quote, but the deficiency is in the answering if that is the case, not the quoted text.