Answer
$(A), 1.3\times 10^{-13}T$
Work Step by Step
We know that
$B=\frac{\mu_{\circ}I}{2\pi r}$
We plug in the known values to obtain:
$B=\frac{(4\pi \times 10^{-7})(5.0\times 10^{-8})}{2\pi (0.075)}$
$B=1.3\times 10^{-13}T$
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