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wetback

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## Homework Statement

The contour consists of a condenser with capacitance C = 2.22*10^-9 F and a coil of copper wire. The diameter of the wire 5*10^-4 m, the length of the coil 20*10^-2 m. Determine the damping logarithmic decrement Λ of the fluctuations?

Given answer:0.018

## Homework Equations

damping logarithmic decrement: Λ=2*Pi/sqrt((4L/CR^2)-1)

self-inductance of a coil: L=4*Pi*10^-7*(N^2/lc)*Sc (N number of turns, lc length of coil, Sc area of coil section)

resistance of the coil: R=(ρCu*lw)/(Pi*(d/2)^2) (ρCu=1.7*10^-8, lw-length of the wire,d-diameter of the wire)

## The Attempt at a Solution

The answer I got by combining the three equations: ~2.79*10^-12 . Probably wrong because differs a lot from the given so I'm asking for help.