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A current I flows an infinitely long wire with cross section in the form of a semi-circular ring of radius \( \mathrm{R} \). The magnitude of the magnetic induction along its axis is
\( \mathrm{P} \)
(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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