# Electric Field Between Capacitor Plates#

Two parallel plates have equal and opposite charges. When the space between the plates is evacuated, the electrical field is $$E = {{params.a }} \times 10^5 \textrm{ V/m}$$. When the space is filled with dielectric, the electrical field is $$E = {{params.b }} \times 10^5 \textrm{ V/m}$$.

## Part 1#

What is the surface charge density on each surface of the dielectric?

## Part 2#

What is the dielectric constant?