ch28-p066 - 66. The unit vector associated with the current...

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66. The unit vector associated with the current element (of magnitude d A ) is ± j. The (infinitesimal) force on this element is dF i d y y G A =− × ± . ±± ji + 0 . 4 j e j e j 03 with SI units (and 3 significant figures) understood. Since ±± ± ji k ×=− and jj ×= 0, we obtain ( ) 42 ˆˆ 0.3 k 6.00 10 N m k. dF iy d y d
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