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Figure shows, in cross-section, several ...

Figure shows, in cross-section, several conductors that carry currents through the plane of the figure. The currents have the magnitudes `i_1=4.0A, I_2=6.0A`, and `I_3=2.0` A, in the directions shown. Four paths labelled a to d, are shown. What is the line integral `intB. dI` for each path? Each integral involves going around the path in the counter-clockwise direction.

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