D4.1. Given the electric field E =(8xyza, +4x za, - 4x ya-) V/m, find the differen- tial amount of work done in moving a 6-nC charge a distance of 2 um, starting at P(2, -2, 3) and proceeding in the direction a =: (a) -$a, +a, +a; (b) $a, -a, -a;; (c) +$a. Ans. -149.3; 149.3; 0 fJ
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