content_image/360567.jpg content_image/360568.jpg content_image/360569.jpg content_image/360570.jpg content_image/360571.jpg content_image/360572.jpg
The electric field may be written as 

Now, the polarization may be expressed as 

In this case, the equation (3) takes the form 

<img src='content_image/360567.jpg'>

<img src='content_image/360568.jpg'>

<img src='content_image/360569.jpg'>

<img src='content_image/360570.jpg'>

The kinetic energy is 

The work done is 

<img src='content_image/360571.jpg'>

<img src='content_image/360572.jpg'>

