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I have this question:

I am a little confused about the electric field of a very large sheet of something (insulator or conductor)

for a very large sheet, E = sigma_inclosed/2(epsilon_naught), but for a conductor, it is E = sigma_inclosed/epsilon_naught, that is, twice the first case. But I have a question here in my book that says:

A thin conducting plate 50 cm on a length lies in the x-y plane. If it is placed in an external electric field of 8*10^4C directed perpendicular to the plate, find;

1- The charge density of each face of the plate,

2- The total charge on each face.

The answers uses, E = sigma / 2(epsilon_naught) to find sigma,

Shouldn't he used the formula E = sigma_inclosed/epsilon_naught since it is a conducting plate?

M B

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# Homework Help: Charge density!

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