Re: Electric field in a grounded conductor

[Bernard Cleyet <anngeorg@PACBELL.NET>]

not completely.

a grounded conducting enclosure will shield the effect of internal
charge(s) (static case).

But the presence of the conductor will radically modify the [internal]
field, at least near the room.  If you don't like theory, do the two
dimensional case using sl. conducting plotting paper. (Pasco)  Ludwik
conducted a long thread on this subject without the shielding. [I did
post the effect of painting an encircling grounded conductor (not so
curiously grounding has little effect, but just the presence of the
encircling conductor does)]  If you want to do some reading, I recommend
Feynman et al. V. II  [It's more transparent than Harnwell and other
texts.]  Be aware; he has a blooper on this subject. [The conductor must
be grounded to shield the outside from internal charges.]

bc

P.s. before doing anything consider the meaning of equipotential
[surface(s)] and the relationship of charge(s) to potential(s).

"Casuga, Adele" wrote:
> I am having a very hard time explaining this question from "Physics" by
> Eugene Hecht 1994 (p. 619 # 3)
>
> "Figure Q3 shows a dipole in a room (which is represented by a large
> grounded conductor). Make a rough sketch of its E-field and explain your
> reasoning."
>
> I would reason that the electric field inside the box would behave as if the
> box weren't there.  Outside the box, there shouldn't be any field.  What
> about at the inside and outside surface of the box?