A uniform magnetic field points upward, in the plane of the paper. A wire is perpendicular to the paper. When the
wire carries a uniform current, the net magnetic field at point 2 is zero.
A. What is the direction of the current in the wire—into or out of the paper? Explain.
B. Point 3 is twice as far from the wire as point 2. If the net magnetic field at point 3 is T, how much current is flowing in the wire?
C. Point 1 is the same distance from the wire as point 2. What is the net magnetic field strength at point 1?