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Unformatted text preview: EEE 241 Solution to Assignment #7 P.6-3 A current I flows in the inner conductor of an infinitely long coaxial line and returns via the outer conductor. The radius of the inner conductor is a , and the inner and outer radii of the outer conductor are b and c , respectively. Find the magnetic flux density B for all regions and plot | B | versus r . 0.1 Solution b a c Solution: Assume current I flows in the + z-direction in the inner conductor with uniform current density given by J i = a z I a 2 Assume current I flows in the- z-direction in the outer conductor with uniform current density given by J O =- a z I ( c 2- b 2 ) From symmetry and Amperes circuital law, we have B = a I encl 2 r 1 Evaluation of I encl yields I encl = ( r a ) 2 I , 0 r a I , a < r < b parenleftBig c 2 r 2 c 2 b 2 parenrightBig I , b r c , r > c Hence, B = a Ir 2 a 2 , 0...
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This note was uploaded on 10/15/2008 for the course EEE 241 taught by Professor Ayanar during the Spring '07 term at ASU.
- Spring '07