作者ian60702 (pacific hero)
看板Physics
标题[题目] 能量密度
时间Thu May 7 22:16:56 2009
[领域]普通物理
[来源]halliday 8th 习题ch30 71题
[题目]
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)
[瓶颈]
u(i^2)
答案好像有误，他给─────
8(R^2)
请问是不是少除了pi平方?
还是在下观念有误....烦请版上高手指点...感恩
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1F：→ alan7872:要除以pi^2 05/07 22:27