The document summarizes Maxwell's equations: 1) Maxwell's equations explain how electric charges and currents produce magnetic and electric fields. Maxwell also calculated the speed of electromagnetic waves to be the speed of light. 2) Maxwell's second equation states that the net magnetic flux through a closed surface is always zero. 3) Maxwell's third equation shows that a changing magnetic field produces an electric field. It is derived from Faraday's law of induction. 4) Maxwell's fourth equation relates the curl of the magnetic field to the electric current density and displacement current density. It is based on Ampere's law.