Can Electric Field Penetrate Non-Conducting Sheets?

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SUMMARY

The discussion clarifies that electric fields can penetrate non-conducting sheets, such as plastic, without being affected by the material itself. The key point is that non-conducting materials do not allow charges to move, meaning the electric field remains unchanged as it passes through. The absence of a dielectric constant indicates zero polarization, confirming that the electric field vectors remain parallel to the normal vectors on both sides of the sheet. The distance from the charged surfaces does not influence the electric field strength at a given point.

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http://noether.physics.ubc.ca/Physics153/assignt222k6.pdf
^ number 2.

I don't get this problem. if the plastic sheets are non-conducting, does that mean the electric field can't penetrate the sheets? and how should i do this problem?
 
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Nonconducting means that the charges stay where they're put.
Since they don't tell you a dielectric constant (polarization \kappa),
presume that there is ZERO polarization in the material ...
the E-field is completely uneffected by the plastic (but NOT the charges!).

Start by enclosing all 4 charged surfaces
(but not the negative charge at infinity ...)

Incidently, the distance of the point from the surfaces is unimportant.
 

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