# Divergence of electric field

Why is the divergence of electric field not zero for a material with non-constant conductivity?

Dr. Courtney
Gold Member
2020 Award
Why would it be?

Dale
Mentor
2020 Award
Why is the divergence of electric field not zero for a material with non-constant conductivity?
There are times when a material with non constant conductivity will have an E field with zero divergence. Can you think when that happens? So what is different?