P23_050 - 50. (a) From Eq. 23-38 (and the facts that = 1...

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50. (a) From Eq. 23-38 (and the facts that ˆ i · ˆ i=1and ˆ j · ˆ i = 0), the potential energy is U = ~p · ~ E = [(3 . 00 ˆ i+4 . 00 ˆ j)(1 . 24 × 10 30 C · m)] · [(4000 N / C) ˆ i] = 1 . 49 × 10 26 J . (b) From Eq. 23-34 (and the facts that ˆ i × ˆ i=0and ˆ j × ˆ i= ˆ k), the torque is = ~p × ~ E =[(3 . 00 ˆ . 00 ˆ j)(1 . 24 × 10 30 C · m)] × [(4000 N / C) ˆ i] =( 1 . 98 × 10 26 N ·
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