Physics 204: Intermediate Electricity and Magnetism II

A guide to basic information resources on Intermediate Electricity and Magnetism II, Physics 204.

Reference data

WolframAlpha
Compute pretty much anything computable.
NIST Reference on Constants, Units, and Uncertainty
One of THE authoritative sources for such data
NIST Standard Reference Data
List of free databases of Standard Reference Data
WebElements
Key information about the chemical elements in the periodic table.
RefractiveIndex.INFO
Refractive index database of many materials.