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Two parallel plates have equal and oppos...

Two parallel plates have equal and opposite charges. When the space between the plates is evacuted, the electric field is `E_0=3.20xx10^5V//m`. When the space is filled with electric the electric field is `E-2.50xx10^5V//m`
a. What is the dielectric constant?
b. What is the charge density on each surface of the dielectric?

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