A Coaxial Wire Consists of a Copper Wire of Radius

question 19

Multiple Choice

A coaxial wire consists of a copper wire of radius 1 mm surrounded by a copper sheath of inside radius 1.5 mm and an outside radius 2 mm.A 3-A current flows in one direction down the core and in the opposite direction down the sheath.What is the magnitude of the magnetic field at a radius of 3 mm from the center of the wire?

• A)0 T
• B)1.25 µT
• C)3.15 µT
• D)4.20 µT
• E)5.15 µT

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