content_image/373408.jpg content_image/373409.jpg content_image/373410.jpg content_image/373411.jpg content_image/373412.jpg content_image/373413.jpg
lowing relationship: 

<img src='content_image/373408.jpg'>

<img src='content_image/373409.jpg'>

Substituting (6) and (7) into (4) and (5), the average of each term in the stress tensor could be represented by 

<img src='content_image/373410.jpg'>

<img src='content_image/373411.jpg'>

<img src='content_image/373412.jpg'>

Here, E ( k 0 , r , s$_{i}$ ) and H ( k 0 , r , s$_{i}$ ) are the electric/magnetic field at location r in the geometry under the excitation of source s$_{i}$ . Their corresponding relationships are summarized in Table I. 

<img src='content_image/373413.jpg'>

If the object is made of perfect conducting material, there is only induced electric current J flowing on the surface. The scattered electric field and magnetic field in the free space region could be obtained from the induced electric current by L and K operators respectively 

