A long, straight wire (radius = 2.0 mm) carries a current of 2.0 A distributed uniformly over a cross section perpendicular to the axis of the wire. What is the magnitude of the magnetic field at a distance of 1.0 mm from the axis of the wire?
A) 0.40 mT
B) 0.80 mT
C) 0.10 mT
D) 0.20 mT
E) 0.75 mT

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The Answer of A long, straight wire (radius = 2.0 mm) carries a current of 2.0 A distributed uniformly over a cross section perpendicular to the axis of the wire. What is the magnitude of the magnetic field at a distance of 1.0 mm from the axis of the wire?
A) 0.40 mT
B) 0.80 mT
C) 0.10 mT
D) 0.20 mT
E) 0.75 mT

A Long, Straight Wire (Radius = 2