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.
4 July is the most significant national holiday in the United States. It celebrates the Declaration of Independence, adopted on 4 July, 1776. The Thirteen Colonies of America declared themselves to be states and no longer part of the British Empire, though the revolutionary war continued for some time after.