56. The unit vector associated with the current element (of magnitude d` )is − ˆ j. The (inFnitesimal) force on this element is d ~ F = id ` ( − ˆ j) × (0 . 3 y ˆ i+0 . 4 y ˆ j) with SI units (and 3 signiFcant Fgures) understood. (a) Since ˆ j × ˆ i= − ˆ kand ˆ j × ˆ j = 0, we obtain d ~ F =0 . 3 iy d` ˆ k= ( 6 . 00 × 10 − 4 N / m 2 ) yd ` ˆ
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This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.