1. The problem statement, all variables and given/known data 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 = 4.4 A in one direction, and the outer conductor carries current I2 = 6.9 A in the opposite direction. What is the magnitude of the magnetic field at the following distances from the central axis of the cable? (μ0 = 4π × 10-7 T · m/A) (A) At r = 0.060 m (in the gap midway between the two conductors) (B) At r = 0.150 m (outside the cable) 2. Relevant equations 1. B = (μ_0/(4pi))*(Q)*(v x r)/(r^2) 2. B = ((μ_0/(2pi))*(I)*(r^2 / R^3) 3. The attempt at a solution I'm just really not sure how to solve this. Do I plug this in the 1st equation or the second? What is r (and R)? Is there a different equation I can use?