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## Homework Statement

An uncharged conducting slab is placed between two infinitesimally thin insulating plates with surface charge densities [tex]\sigma_1[/tex] and [tex]\sigma_2[/tex], respectively. Describe what fields are induced in the conducting slab and their magnitudes.

## Homework Equations

None?

## The Attempt at a Solution

This is the answer I was given with no explanation. I would like someone to explain this, please.

" When the conducting slab is inserted in these respective ﬁelds, the induced charges on its surfaces, say [tex]\sigma_i[/tex] on the top surface and [tex]-\sigma_i[/tex] on the bottom surface are such that the ﬁeld these charges produce inside the slab (outside the induced ﬁeld is zero)

[tex]E_i = \frac{-\sigma_i}{\epsilon_0}[/tex]"

My two questions: why is the induced field outside = 0? Why is the induced field inside like above?