I'm trying to solve the following problem but I have some doubts.

I have a disk of radius $R$ with charge $Q$ (positive) and, at distance $d$, an uncharged conductor (of radius $R$ as well). Both are centered at the same axis.

Supposing $R$ is very big compared to the considered distances, I'm asked about the electric field $\vec E$ between the disk and the conductor, inside the conductor, and above it.

I know, since $R$ is big, I can approximate the disk as an "infinite" plane, so $\vec E$ will be uniform. In that case, it's easy to calculate the field caused by the disk alone. But total $\vec E$ will be $\vec E_{\text{disk}} + \vec E_{\text{conductor}}$ and I can't figure out how to find this last one.

Here's what I'm talking about if it's not so clear (my english may not be very good).

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Any help would be appreciated.


1 Answer 1


The presence of the conductor will not have any effect on E outside the conductor but inside the conductor E=0 , because guass law should hold .

You can say that E above and in between conductor will be same as E due to infinite charged plate


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