A current \( I \) flows in an infinitely long wire with cross-section in the form of a semicircu...

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A current \( I \) flows in an infinitely long wire with cross-section in the form of a semicircular ring of radius \( R \). The magnitude of the magnetic induction along its axis is
(a) \( \frac{\mu_{0} I}{\pi^{2} R} \)
(b) \( \frac{\mu_{0} I}{2 \pi^{2} R} \)
(c) \( \frac{\mu_{0} I}{2 \pi R} \)
(d) \( \frac{\mu_{0} I}{4 \pi R} \)
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