The figure below shows a long conducting coaxial cable and gives its radii (R₁

= 2.5cm, R₂=8.3cm, R3-15.2cm). The inner cable has a uniform current density

of J = 1.2 A/m², and the outer cable carries a uniform current I = 3.4A flowing in

opposite direction. Assume that the currents in each wire is uniformly

distributed over its cross section. Determine the magnitude of the magnetic

field in terms of Ho at a distance r = 20.3cm from the center of the cable.

Express your answer using two decimal places.

R

R2 R3

Answer:

I