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A plasma diode appears resistive to an external observer at the magnetized electron series resonance (MESR). The authors derive the MESR resonant frequencies from an equivalent circuit model using linear cold plasma theory. The noise current from a decaying plasma is predicted to exhibit the MESR resonant frequencies and is verified by observing the spectra of the noise currents in 1d3v simulations. The spectra compare well with the theoretical values, which depend on the (central) plasma density and the sheath thickness. The latter is obtained from the (warm) plasma simulations.