Question

Super fine 40-gauge copper wire has a diameter of only and weighs only . Suppose a spool of 40-gauge wire weighs 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.

Answer 1

Answer:

w±2.5*Δw

Step-by-step explanation:

the weight corresponding to gauge weight w =mg =ρvg where ρ is the density of copper, v is volume = πr^2*l the r = 20 mm for diameter 40 gauge,

V = 0.0004πl, l is the length of the copper wire, hence calculate the error with gauge different.