A wire carrying current \( i \) has the configuration as shown in figure-4.266. Two semi-infinit...

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A wire carrying current \( i \) has the configuration as shown in figure-4.266. Two semi-infinite straight sections, both tangent to the same circle, are connected by a circular arc of central angle \( \theta \), along the circumference of the circle, with all sections lying in the same plane. What must \( \theta \) be for \( B \) to be zero at the cenre of the circle?
Figure \( 4.266 \)
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