Question: A coaxial cable has a thin inner conducting wire surrounded by a cylindrical conducting shell with inner radius a = 3 m m and outer

A coaxial cable has a thin inner conducting wire surrounded by a cylindrical conducting shell with inner radius a=3mm and outer radius b=5mm. The cross section of the cable is shown in the diagram. The magnetic field magnitude 2 mm from the center is 18 mT , and the field 6 mm from the center is zero. What is the magnitude of the magnetic field 4 mm from the wire's center?
A coaxial cable has a thin inner conducting wire

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