Accelerated electric charge

1. Aug 18, 2005

asdf1

why does an accelerated electric charge produce energy?

2. Aug 18, 2005

Tide

Do you mean why does an accelerated charge radiate?

3. Aug 18, 2005

asdf1

yes, you're right~

4. Aug 18, 2005

Meir Achuz

This can only be seen in a detailed derivation of the radiation E and B fields.
See almost any intermediate or higher EM text.
The key point is that, for raditation, E and B fall off like 1/r instead of 1/r^2.
This follows from the use of the retarded time.
It turns out that if the velocity is constant, the retarded time does not result in the 1/r dependence.

5. Aug 19, 2005

thanks! :)