Electric potential energy

1. Dec 7, 2012

stefano colom

my professor has explained Electric potential energy Law U=∫D*E above all the space. he said you can not use for some kind of materials. l can 't remember if they are Ferroelectricity or piezoelectric materials. then can you say to me the reason too? thank you

2. Dec 7, 2012

3. Dec 7, 2012

Darwin123

There is a hysteresis effect in ferroelectric materials, too.

4. Dec 7, 2012

stefano colom

but why couldn't l use for the ferroelectricity materials

5. Dec 8, 2012

Meir Achuz

The derivation of the D.E form requires that the relation between D and E be linear.
It is not for ferroelectric materials.