Magnetic Field due to a current loop

  • #1
[SOLVED] Magnetic Field due to a current loop

Homework Statement



A single loop of wire of radius 3 cm carries a current of 2.6 A. What is the magnitude of B on the axis of the loop at 2 cm?


Homework Equations



B=[tex]\mu[/tex]/(4[tex]\pi[/tex]) * 2[tex]\pi[/tex](R^2)*I/(z^2+R^2)^(3/2)



The Attempt at a Solution


I = 2.6 A
R = .03 m
z = .02m

I calculate .000031 T
It should just be a simple matter of plugging in numbers, but every time I use this equation it ends up being wrong. If anyone could tell me what I might be doing wrong it would be greatly appreciated.
 

Answers and Replies

  • #2
Doc Al
Mentor
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Looks OK to me. Why do you think it's wrong?
 
  • #3
It is computerized homework, so when I put in the answer that I calculated it keeps telling me that it is wrong. I have done the same thing with multiple different distances, and they all come up wrong, so I believe that it is something that I am doing, I am just not sure what
 
  • #4
Doc Al
Mentor
45,093
1,397
Those online systems can be flaky. I don't think you're doing anything wrong. Your equation is correct and your answer is correct.

Things to check: Are you sure they want the answer in Teslas? How many sig figs does the system like?
 
  • #5
I finally figured it out. It turns out that the system decided it wanted it in scientific notation. Thanks for your help!
 

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