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Question:

what is the inductance of a hollow copper tube when used as an inductor ?

Also ,when there are two capacitors and two inductors in a circuit,how do I calculate the resonant frequency ?

Answer:

Inductance of a wire is ??L/8π ?? is the magnetic constant 1.2566e-6 H/m (or T·m/A) L is length in meters Inductance of a hollow cylinder is (??L/2π)(ln((2L/a)–1) a is the radius. thickness is negligible. 2) depends on how they are connected. Combine the two caps as series or parallel, ditto inductors.

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