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The magnetic induction at the point \( O \), if the wire carries a current \( i \), is
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(1) \( \frac{\mu_{0} i}{2 R} \)
(2) \( \frac{\mu_{0} i}{2 \pi R} \)
(3) \( \frac{\mu_{0} i\left(\pi^{2}+4\right)^{1 / 2}}{4 \pi R} \)
(4) \( \frac{\mu_{0} i\left(\pi^{2}+4\right)}{4 \pi R} \)
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