A wire carrying current i is shaped as shown. | vedclass

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(B) According to the Biot-Savart law,the direction of the magnetic field produced by a current-carrying wire is given by the Right-Hand Thumb Rule.For

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Perpendicular to the plane of the paper and directed into the paper

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(B) According to the Biot-Savart law,the direction of the magnetic field produced by a current-carrying wire is given by the Right-Hand Thumb Rule.For the straight segments and the quarter-circular arc $AB$,the current flows in a path that,when viewed from the perspective of point $C$,creates a magnetic field directed into the plane of the paper.Specifically,by curling the fingers of the right hand in the direction of the current $i$,the thumb points into the plane of the paper at point $C$.Therefore,the magnetic field is perpendicular to the plane of the paper and directed into the paper.

$A$ wire carrying current $i$ is shaped as shown. Section $AB$ is a quarter circle of radius $r$. The magnetic field at the center $C$ is directed:

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