The fact that current carrying loops experience a net torque in a magnetic field is the principle behind the electric motor, where the electrical energy involved in establishing a current is converted into the mechanical energy of rotating a shaft.
From 1776 until the present day, July 4th has been celebrated as the birth of American independence, with typical festivities ranging from fireworks, parades and concerts to more casual family gatherings and barbecues. Play video Declaration of Independence. Play video History of the Fourth of July.
Independence Day, or the Fourth of July, celebrates the adoption by the Continental Congress of the Declaration of Independence on July 4, 1776. On the 236th birthday of the United States, explore nine surprising facts about one of Americaâs most important founding documents.