1. The problem statement, all variables and given/known data The current in the wire is going down. The wire is in the z axis position going up and down. A compass is placed below the wire...for example the wire passes through (0,0) the origin on the x, y plane. The compass would be placed in the (0,-1) position on the x,y plane. Show the vector diagram of the two magnetic fields (B of earth and B of wire) and the resultant field. 2. Relevant equations None 3. The attempt at a solution I'm not sure if my answer is right: The direction of the magnetic field is clockwise. If a compass is placed south of the wires the direction of the magnetic field should be pointing directly to the left, since at a pt the direction of a magnetic field is tangent to that point on the magnetic field. Therefore, should the vectors look like this: B of earth pointing directly North and B of wire pointing directly west. the resultant field should be between those two vectors making a 45 degree angle with a direction Northwest.