Question: Figure P28.20 shows a wire segment bent into a halfcircle, with the center of curvature labeled (P). If the wire of which this segment is

Figure P28.20 shows a wire segment bent into a halfcircle, with the center of curvature labeled $P$. If the wire of which this segment is a part is extremely long and carries a current $I$, what is the direction of the magnetic field at P?

Data from Figure P28.20

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