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Homework Help: AC Voltage applied to coaxial cable

  1. Jan 25, 2009 #1
    1. The problem statement, all variables and given/known data

    A coaxial cable consists of two long, concentric, perfect conductors. The inner conductor is a right circular cylinder of radius a, while the outer conductor is a thin, hollow annular cylinder of inner radius b.

    Suppose a half-infinite length of such a coaxial cable stretches between z = 0 and z = +∞. A signal generator is attached between the two conductors at z = 0, and a periodic voltage V(t) = V(0)sin(ωt) is applied. What is the current I(z,t) that flows along the surface of the inner conductor at some fixed z > 0?

    3. The attempt at a solution

    This question was posed for revision of a previous course. But in that course little if any AC circuit work was done. The precursor question to this was to find the capacitance and inductance per unit length of an infinite coaxial cable and these were fine, but I'm completely lost with this.

    Any suggestions on how to get started?

  2. jcsd
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