An arc of a circle of radius $R$ subtends an angle $\frac{\pi}{2}$ at the centre. It carries a current $I$. The magnetic field at the centre will be ($\mu_0 =$ permeability of free space).
- A$\frac{\mu_0 I}{2 R}$
- B$\frac{\mu_0 I}{8 R}$
- C$\frac{\mu_0 I}{4 R}$
- D$\frac{2 \mu_0 I}{5 R}$
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