救命，i(t)產生磁通量Φ， 屏蔽板上為了產生抵抗磁通會感應出電流ic (即渦流) 請問ic會怎麼流 (a) http://img145.imageshack.us/img145/5301/inductedcurrenttx1.png (b) http://img379.imageshack.us/img379/3975/eddycurrentfv9.png and then 請問要怎麼求感應電流ic咧 我找很久 只在這篇 Principles of Power-Frequency Magnetic Field Shielding with Flat Sheets in a Source of Long Conductors http://ieeexplore.ieee.org/iel1/15/11258/00536075.pdf 有提到 J(x,y)=-j2πfσΑ(x,y) 不知道此式怎麼來的 有高手能救救我嗎 Thanks in advance! --

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