$A$ steady current is set up in a cubic network composed of wires of equal resistance and length $d$ as shown in the figure. What is the magnetic field at the centre $P$ due to the cubic network?
- A$\frac{\mu_0}{4 \pi} \frac{2 I}{d}$
- B$\frac{\mu_0}{4 \pi} \frac{2 I}{\sqrt{2} d}$
- C$0$
- D$\frac{\mu_0}{4 \pi} \frac{\theta \pi I}{d}$
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