Find out magnetic field at point $O$ ?
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$\mathrm{B}=\frac{1}{4} \times \frac{\mu_{0} \mathrm{I}}{2 \mathrm{R}}$
$\mathrm{B}=\frac{4 \pi \times 10^{-7} \times 10}{2 \times 5 \times 10^{-2}} \times \frac{1}{4} \,\mathrm{T}=\pi \times 10^{-5} \,\mathrm{T}$
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