Distance away to create the same magnetic field strength?

AI Thread Summary
To determine the distance from a wire carrying a 38 A current where the magnetic field strength equals 4.35 x 10^-3 T, the formula B=(μo/2pi)*(I/d) is used. The user calculated d to be 0.0017 m but received feedback indicating the answer was incorrect. Suggestions included checking significant figures and trying a slightly adjusted value of 0.00169 m, but this also did not yield the correct answer. The discussion highlights the challenges of online homework systems and potential issues with precision in calculations. Further assistance is sought to resolve the discrepancy in the expected answer.
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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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