78. Eq. 29-17 applies for each wire, with rRd=+222/bg(by the Pythagorean theorem). The vertical components of the fields cancel, and the two (identical) horizontal components add to yield the final result ()60022/221.2510T22/2iiddBrrRdµµπ−⎛⎞===×⎜⎟⎝⎠+, where (d/2)/ris a trigonometric factor to select the horizontal component. It is clear that
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