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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.

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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?

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