An arc of a circle of radius \( R \) subtends an angle \( \frac{\pi}{2} \) at the centre. It car...
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0An 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
(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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