Solved: A long vertical wire carries an unknown current.
Chapter 29, Problem 72(choose chapter or problem)
A long vertical wire carries an unknown current. Coaxial with the wire is a long, thin, cylindrical conducting surface that carries a current of 30 rnA upward. The cylindrical surface has a radius of 3.0 mm. If the magnitude of the magnetic field at a point 5.0 mm from the wire is 1.0 /LT, what are the (a) size and (b) direction of the current in the wire?
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