A coaxial cable consists of an inner cylindrical conductor of radius R1 = 0.040 m on the axis of an outer hollow cylindrical conductor of inner radius R2 = 0.080 m and outer radius
The inner conductor carries current
in one direction,and the outer conductor carries current
in the opposite direction.What is the magnitude of the magnetic field at the following distances from the central axis of the cable?
(a)At r = 0.060 m (in the gap midway between the two conductors)
(b)At r = 0.150 m (outside the cable)
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