Two parallel plates have equal and opposite charges

PHYSICS · Multi-part · CBSE · Physics · Electrostatic Potential and Capacitance · Electrostatic Potential and Capacitance

Problem

Two parallel plates have equal and opposite charges. When the space between the plates is evacuated, the electric field is E0=3.20×105 V m−1E_0=3.20\times10^5\,\text{V m}^{-1}. When the space is filled with a dielectric, the electric field is E=2.50×105 V m−1E=2.50\times10^5\,\text{V m}^{-1}. (1) What is the dielectric constant? (2) What is the charge density on each surface of the dielectric?

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