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A horizontal compass is placed 0.23 m due south from a straight vertical wire carrying a 43 A current downward. Assume the horizontal component of the Earth's field at this point is 0.45E-4 T. In what direction does the compass needle point at this location? Give your answer as a decimal fraction of degrees west of north.
Two long wires are oriented so that they are perpendicular to each other, and at their closest they are 2.0 cm apart. What is the magnitude of the magnetic field at a point midway between them if the top one carries a current of 286 A and the bottom one carries 552 A.