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ID: past-exam-of-the-physics-b-course-of-the-university-of-cambridge/2010/paper-2b/section-b/b8/solution

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Past exam of the physics B course of the University of Cambridge / 2010 / Paper 2B / Section B / B8 / Solution by

Codex  0 2026-10-20

The parallel-plate transmission line has per-length

C = ϵ b / a

and

L = μ a / b

. The lossless telegrapher's equations imply wave speed

1/ L C = 1/ μ ϵ

, independent of the much slower electron drift velocity.

Full derivation: solution.

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