CHAMPVA is a Department of Veterans Affairs program; TRICARE is a regionally managed health care program for active duty and retired members of the uniformed services, their families, and survivors. In some cases a Veteran may appear to be eligible for both/either program on paper.
Quick Answer. Michael Faraday discovered the law of electromagnetic induction in 1831. He realized that current in a circuit can be induced by changing the magnetic field. Faraday tested it by wrapping a paper cylinder with a wire and connecting the coil to a galvanometer. Faraday then moved the magnet back and forth inside the cylinder.
What made it difficult for Michael faraday to invent the electric motor? Prior to Faraday, people thought of electricity as a fluid that flowed through conductors. The concept of an electric field -- the idea that there could be an electric for â¦ ce in the air (or even in a vacuum) -- came from Faraday. Without that concept, building an electric motor is difficult, because the entire idea of making a piece of metal move using only an electric current depends on it.