1. A moving electric charge produces both an electric field and a magnetic field around it. It also experiences a gravitational field due to its mass. 2. Electromagnetic induction occurs when a changing magnetic field generates an electric field. This effect is described by Faraday's law of induction and Lenz's law. 3. Maxwell's equations unified electric and magnetic phenomena and predicted electromagnetic waves. They consist of Gauss's law, Gauss's law for magnetism, Faraday's law of induction, and Ampere's law with Maxwell's addition.