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.
The Faraday cage was invented by Michael Faraday (22 September 1791 â 25 August 1867) when he discovered that radiation shielding of electromagnetic radiation could be accomplished with wire mesh or screen. Many people are familiar with this principle as it is used to keep radiation within a microwave oven.