I have an insulator with dielectric constant k. If I place it in a region in vacuum with a field E, what is the induced field inside the dielectric?
E(1−1k)
In the above question, the external electric field is E and the net field,
E′=Ek
The difference between the external and the net field must be induced field right?
We have
E′=E−Eind
Eind−E−E′
=E−Ek
=E(1−1k)