Super fine 40-gauge copper wire has a diameter of only 0.080mm and weighs only 44.5/gkm . suppose a spool of 40-gauge wire weighs 209.g less after some wire is pulled off to wind a magnet. how could you calculate how much wire was used? set the math up. but don't do any of it. just leave your answer as a math expression. also, be sure your answer includes all the correct unit symbols.