原帖由 Amuro 於 2011-11-2 07:11 PM 發表
同電學無關 只係搵relationship
MLT^-1果d
但我睇唔明..
原帖由 Amuro 於 2011-11-1 11:10 PM 發表
The rate of flow of electromagnetic energy P through an area A placed normal to an electromagnetic wave will depend upon the permeability of free space μ0, and upon the instantaneous values of the electric field E, and magnetic field B. Find a possible relationship between these five quantities.
要是跟electromagnetism 無關的話, 那些 quantities' relationship 只有英文字母...