A square wire loop 15.0 cm on each side carries a clockwise current of 4.00 A . Part A Find the magnitude of the magnetic field at its center due to the four 1.60 -mm wire segments at the midpoint of each side. Express your answer with the appropriate units.

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me

this would be about 43%