A coaxial cable (like those used in cable TV installations and withVCRs) consist

Question

A coaxial cable (like those used in cable TV installations and withVCRs) consists of a central conducting wire imbedded in acylindrical insulating core, which is then surrounded by anotherouter conducting cylinder usually made of wrapped aluminum foil orcopper braid. Suppose such a cable carries a current of2.40 A flowing in one direction along thewire and 2.40 A flowing in the oppositedirection along the foil. Use Ampère's Law to find themagnitude of the magnetic field at a radial distance r =1.2 mm that is between conductors?
1 T

Explanation / Answer

we assume a circular loop around the inner cable hence we have fromamperes law that 0*2.4=2*1.2*10-3*B as B will be in tangential direction for the loop hence we have B=3*10-4T

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