Re: electric strength for "x" cm of "y" material

["Tesla list" <tesla@xxxxxxxxxx>]

Original poster: "Antonio Carlos M. de Queiroz" <acmdq@xxxxxxxxxx>

Tesla list wrote:
> Original poster: "Dmitry (father dest)" <dest@xxxxxxxxxxx>
>
>  > it sure is
>  > difficult to keep the corona from forming, especially when the added
>  > dielectric makes the E-field greater outside of the dielectric!
> outside of the dielectric? how it possible? there`s an air and the
> conductors outside - why does the field increase outside?

Dielectric materials attract the electric field generated by nearby
charges to them, much in the way a magnetic material attracts magnetic
fields. If you put a dielectric plate between two oppositely
charged bodies, the electric field at the surface of the plate
becomes higher than it was without the plate, because the field
lines becomes more concentrated. So, if there is some corona
between two conductors, placing an insulating plate between them
can only increase the corona. In other hand, a possible solution
is to place dielectric plates behind the conductors, not between
them.

Antonio Carlos M. de Queiroz