In Figure P28.73, point P is the common center of two circular arcs of wire, the larger

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In Figure P28.73, point P is the common center of two circular arcs of wire, the larger of radius \(70 \mathrm{~mm}\) and the smaller of radius \(20 \mathrm{~mm}\). What are the magnitude and direction of the magnetic field at \(\mathrm{P}\) if the current through the wire is \(3.0 \mathrm{~mA}\) ?

Data from  Figure P28.73

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