A wire of length math xmlns=http://www.w3.org/1998/Math/MathMLmn1/m...

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A wire of length math xmlns=http://www.w3.org/1998/Math/MathMLmn1/mn/math is folded to form double circular loop. If current in the wire is \( i \). the magnetic field at the centre is
(1) \( \frac{\mu_{0} i \pi}{2 l} \)
(2) \( \frac{\mu_{0} i \pi}{l} \)
(3) \( \frac{2 \mu_{0} i \pi}{l} \)
(4) \( \frac{4 \mu_{0} i \pi}{l} \)
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