Compute the dielectric constants of the media in the following scenarios:

i. The electric potential due to a 1 ∗ 10^-9C charge 1 meter away on a test charge is 9 volts. What might be the medium in this interaction?

ii. The electrostatic energy is 2.93 ∗ 10^-20J for two electrons one angstrom apart. What might be the medium in this interaction?  

iii. Determine the index of refraction and speed of light through each medium material. Take the magnetic permeability through the material to be close to vacuum permeability.