# Electric energy

1. Mar 18, 2004

### burak_ilhan

1)two different formulas for electric field is
a)U=(1/2)Q1V1+(1/2)Q2V2+.....

b)$$U=\int \frac{1}{2}\epsilon.E^2dv$$

Using these how could we perform an experiment to test where the energy located?

2)Since the electric energy density is never negative, how can the mutual electric potential of a pair of opposite charges be negative?

My idea on the first one was following an example in the lecture:
radiowave is a very good example that the energy is on the field lines,because even you stop signalling, the field or the wave still exist in space.Any comment is welcome

Last edited: Mar 18, 2004