Answer
$2.50\times 10^{-5}T$
Work Step by Step
We know that
$B=\frac{\mu_{\circ}I}{2\pi r}$
We plug in the known values to obtain:
$B=\frac{(4\pi\times 10^{-7})(7.81)}{2\pi(0.0625)}$
$B=2.50\times 10^{-5}T$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.