Answer
$B=3.75 \mu \mathrm{T} \text {. }$
Work Step by Step
$$
\text { As in part (d), we get } \\B=\frac{\mu_0 i_d r}{2 \pi R^2}\\\text { Putting values in above formula}\\B=3.75 \mu \mathrm{T} \text {. }
$$
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