André-Marie Ampère ( 20 January 1775 - 10 June 1836 ) was a French physicist and mathematician who is generally regarded as one of the main founders of the science of classical electromagnetism , which he referred to as `` electrodynamics '' .
André-Marie Ampère ( January 20 , 1775 - June 10 , 1836 ) was a French physicist and mathematician who helped discover electromagnetism .