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Two parallel plates have equal and opposite charges.
When the space between the plates is evacuated, the electric field is
E = 3.20 * 10^5 V/m. When the space is filled with dielectric, the electric
field is E = 2.50 * 10^5 V/m. (a) What is the charge density on each
surface of the dielectric? (b) What is the dielectric constant?

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