作者ian60702 (pacific hero)
看板Physics
標題[題目] 能量密度
時間Thu May 7 22:16:56 2009
[領域]普通物理
[來源]halliday 8th 習題ch30 71題
[題目]
A length of copper wire carries a current of i A uniformly distributed through
its cross section,what is the energy density of the magnetic field at the
surface of the wire?(the wire diameter is 2R)
[瓶頸]
u(i^2)
答案好像有誤，他給─────
8(R^2)
請問是不是少除了pi平方?
還是在下觀念有誤....煩請版上高手指點...感恩
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1F：→ alan7872:要除以pi^2 05/07 22:27