Two infinite wires bent in the form of $L$ shape carries current $I$ as shown. What is magnetic field at $O$ ?
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$\mathrm{B}_{1}=\mathrm{B}_{4}=0$
$\mathrm{B}=\mathrm{B}_{2}+\mathrm{B}_{3}\left(\mathrm{B}_{2}=\mathrm{B}_{3}=\frac{\mu_{0} \mathrm{I}}{4 \pi \mathrm{r}} \odot\right)$
$\mathrm{B}=\frac{2 \mu_{0} \mathrm{I}}{4 \pi \mathrm{r}}=\frac{\mu_{0} \mathrm{I}}{2 \pi \mathrm{r}} \odot$
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