content_image/318246.jpg content_image/318247.jpg content_image/318248.jpg
Now consider the magnetic piece: 

<img src='content_image/318246.jpg'>

We will now prove that ( ˆ k × ⃗ E ) · ( ˆ k × ⃗ E ) = ⃗ E · ⃗ E . 

Therefore we find that the energy radiated is 

<img src='content_image/318247.jpg'>

<img src='content_image/318248.jpg'>

