A very long cable made of a solid inner cylinder and a coaxial, cylindrical, outer shell with finite thickness. The inner cylinder carries a current 41 while the outer shell carries a current 21 in the opposite direction (see figure). What is the magnitude of the magnetic field at b
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A very long cable made of a solid inner cylinder and a coaxial, cylindrical, outer shell with finite thickness. The inner cylinder carries a current 4I while the outer shell carries a current 2I in the opposite direction (see figure). What is the magnitude of the magnetic field at b<r<c?
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