that is set back from the surface. Although the field is strengthened to compensate, erasure and writing of the tape is done by the fringing field of the magnetic head, and the magnetization occurs over a length of tape on the same order as the distance between head magnet and the tape....
Don't you just hate it when writers do that (define important stuff [like a head term in its glossary entry, say] parenthetically)? Me too. Another thing not to confuse A with is atomic number -- the number of protons in a nucleus. Don't be too embarrassed; I've been guilty of...
Rex head (Albertosaurus head, actually) as logos, so you might expect them to have a good display. I think they do, but it's no longer very evident from their web pages. Now they want your money. I guess they don't want their institution to go down the toilet the way the Madison...