Distance away to create the same magnetic field strength?

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SUMMARY

The discussion centers on calculating the distance from a straight wire carrying a 38 A current where the magnetic field strength equals that of a refrigerator magnet, measured at 4.35 x 10-3 T. The formula used is B = (μo/2π) * (I/d), with μo set at 4π x 10-7. The initial calculation yielded a distance of 0.0017 m, which was deemed incorrect. Further attempts to adjust the distance to 0.00169 m also failed to yield a correct answer, indicating potential issues with significant figures or the interpretation of the problem.

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1. Homework Statement

At what distance (in m) from a very thin, straight wire carrying a 38 A current would the magnetic field strength be the same as a refrigerator magnet of 4.35 x 10-3 T?

2. Homework Equations

B=(μo/2pi)*(I/d)
where μo=4pi*10^-7

3. The Attempt at a Solution

4.35e-3(d)=2.0e-7*(38)
d=.0017m
It says this is wrong? so I must have done something wrong.. any help would be appreciated!
Thanks for your time!
 
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that's what I got too, is this an online homework? Did you try 0.00169? Sometimes they can be annoying with sig figs.
 
Yes, I just tried that.. and it didn't say it was correct. It usually will give me the answer if it is that close but it says that is the wrong answer.
 

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