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 R3 = 0.090 m. The inner conductor carries current I1 = 1.3 A in one direction, and the outer conductor carries current I2 = 7.8 A in the opposite direction.
A) What is the magnitude of the magnetic field at the following distances from the central axis of the cable? (µ0 = 4p × 10-7 T · m/A)
B) At r = 0.150 m (outside the cable)
At r = 0.060 m (in the gap midway between the two conductors)