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A long, straight wire, carrying a current of 200 , runs through a cubical wooden box, entering and leaving through

holes in the centers of opposite faces (see the figure ). The length of each side of the box is 20.0 . Consider an element of the wire 0.100 long at the center of the box. (Note: Assume that is small in comparison to the distances from the current element to the points where the magnetic field is to be calculated.)

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