MCQ
In the given figure net magnetic field at $O$ will be
- A$\frac{2 \mu_0 \mathrm{i}}{3 \pi \mathrm{a}} \sqrt{4-\pi^2}$
- ✓$\frac{\mu_0 \mathrm{i}}{3 \pi \mathrm{a}} \sqrt{4+\pi^2}$
- C$\frac{2 \mu_0 \mathrm{i}}{3 \pi \mathrm{a}^2} \sqrt{4+\pi^2}$
- D$\frac{2 \mu_0 \mathrm{i}}{3 \pi \mathrm{a}} \sqrt{4-\pi^2}$
