Answer
$B=22.7 \mu \mathrm{T} \text {. }$
Work Step by Step
$$
\text { As in part (b), we obtain a field of } \\B=\frac{\mu_0 i}{2 \pi r}\\\text { Putting the value in above formula}\\B=22.7 \mu \mathrm{T} \text {. }
$$
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