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請問點解答案係 c ?
phys - mechanics
2009-03-18 8:45 am
回答 (1)
2009-03-18 8:54 am
✔ 最佳答案
consider the horizontal wire, magnetic field in region 1, 2 go into the paper and region 3, 4 go out of the paperconsider the vertical wire, magnetic field in region 2, 3 go into the paper and region 1, 4 go out of the paper
cancellation at region 1, 3 and reinforcement at region 2, 4
so the answer is C
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原文連結 [永久失效]:
https://hk.answers.yahoo.com/question/index?qid=20090318000051KK00068