A horizontal wire of length 3.0 m carries a current of 6.0 A and is oriented so that current direction is 500 S of W. The Earth's magnetic field is due north at this point has a strength of 0.14 x 10-4 T. What are the magnitude and direction of the force on wire? O 1.6 x 10 N-4, out of the Earth's surface O 1.6 x 10 N-4, toward the Earth's surface 1.9 x 10 N-4, toward the Earth's surface 1.9 x 10 N-4, out of the Earth's surface None of the choices is correct.

In the figure, four long straight wires are perpendicular to the page, and their cross sections form a square of edge length a = 29 cm. The currents are out of the page in wires 1 and 4 and into the page in wires 2 and 3, and each wire carries 15 A. What is the magnitude of the net magnetic field at the square's center? 2 a 11 a a a