Magnetic Fields and Maximum Current

  • Thread starter Mehta29
  • Start date
  • #1
17
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Hey guys I'm new here and needless to say I am completely lost...

well here is the problem...

What is the maximum current that a wire can carry if an experimenter is performing an experiment 0.60 m away that deals with the Earth's magnetic field (4.5*10-5 T), which she wishes to measure to +/- 1 percent?

i thought I could just plug the #'s given into

B = (4pi*10^-7)I / (2(pi)R)

and i ended up with 135 A...which seemed muuuuuuuuch too high...and assumably was wrong....

(4.5*10^-5) = (4pi*10^-7)I / 2(pi)(.6??)

It would be greatly appreciated if i could get this help tonight...but I just want to understand what I'm doing wrong for the most part...
 

Answers and Replies

  • #2
17
0
well i found the error of my ways...

the whole +/- 1% threw me off...

i get the right answer if i multiply by the magnetic field by 1% and then re-plug everything in...

hopefully this helps someone in the future...
 

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