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The sensitivity of the (b), (d), (f) real and (c), (e), (g) imaginary parts of the eigenfrequencies to (b), (c) gyration resistance, (d), (e) positive capacitance C1 (f), (g) positive inductance L1 perturbation. Solid lines: solution of eigenvalue problem of equatoin (18); green-dashed lines: Puiseux series approximation truncated to its second term. Here, the EPD frequency is unstable, i.e., EPD frequency is purely imaginary. Voltage v1 (t) for the unstable EPD condition in the time-domain, which increases exponentially over time.
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