作者ian60702 (pacific hero)
看板TransPhys
标题[电磁] 能量密度
时间Thu May 7 22:29:18 2009
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)
u(i^2)
答案给─────
8(R^2)
请问是不是少除了pi平方?
还是在下观念有误....烦请高手指点...感恩
--
※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 61.229.248.6