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A coaxial cable consists of two long concentric conducting tubes of length l, the inner...

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Physics

A coaxial cable consists of two long concentricconducting tubes of length l, the inner one of radius a and theouter one of radius b. Assume that the zˆ direction lies along theaxis of the cable. A current, I, flows down the inner conductor inthe zˆ direction and returns in the outer conductor, where in eachcase the current is uniformly spread out over the surface.
(a) Determine the magnetic field B everywhere. [5]
(b) Find the self-inductance per unit length. [5]

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