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The magnetic field intensity at the point \( O \) of a loop with current \( i \), whose shape is illustrated below is
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(1) \( \frac{\mu_{0} i}{4 \pi}\left[\frac{3 \pi}{2 a}+\frac{\sqrt{2}}{b}\right] \)
(2) \( \frac{\mu_{0} i}{4 \pi^{2}}\left[\frac{2}{a}+b\right] \)
(3) \( \frac{\mu_{0} i}{2 \pi}\left[\frac{1}{a}+\frac{1}{b}\right] \)
(4) \( \frac{\mu_{0} i}{4 \pi}\left[\frac{1}{a}+\frac{1}{b}\right] \)
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