28 60 Figure 29-56a shows two wires, each carrying a current. Wire 1 consists of a circular arc of radius 

 and two radial lengths; it carries current 

 in the direction indicated. Wire 2 is long and straight; it carries a current 

 that can be varied; and it is at distance 

 from the center of the arc. The net magnetic field 

 due to the two currents is measured at the center of curvature of the arc. Figure 

 in the direction perpendicular to the figure as a function of current 

. What is the angle subtended by the arc? (a) (b)

29.P.28

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29.P.28

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