Consider a coaxial cable, which consists of a thin wire inside a thin cylindrical conducting shell, as illustrated in the figure. The central wire carries a current Io = 10μA inwards, while the outer cylindrical shell carries a current outwards with a uniform current density Jo. The outer shell has a thickness of a = 100μ m and a radius of R = 5/3 mm. Assuming that a << R, determine the value of J, required to achieve a zero magnetic field outside the cable. [Take π = 3] R akR O a. 105 A/m² O b. 5 x 104 A/m² O c. 1 A/m² O d. 2 x 105 A/m² Oe. None of the above

Consider a coaxial cable, which consists of a thin wire inside a thin cylindrical conducting shell, as illustrated in the figure. The central wire carries a current Io = 10μA inwards, while the outer cylindrical shell carries a current outwards with a uniform current density Jo. The outer shell has a thickness of a = 100μ m and a radius of R = 5/3 mm. Assuming that a << R, determine the value of J, required to achieve a zero magnetic field outside the cable. [Take π = 3] R akR O a. 105 A/m² O b. 5 x 104 A/m² O c. 1 A/m² O d. 2 x 105 A/m² Oe. None of the above