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Methodological aspects of analysis of nonlinear effects in the course on general physics

“…If we set the magnetic field penetration depth into the material, we can estimate the value of η (using the literature data [3]). Knowing η, we would find the frequencies ω 0 , ω m , at which nonlinear oscillations are possible…”

“…It is well known that in a laboratory practical course classical forced oscillations are generated by immersion of a small-sized ferromagnetic rod into a nonuniform magnetic field of a variable frequency. In this case, however, nonlinear oscillations might appear if we replace the ferromagnetic material by a conducting nonferomagnetic load [3]. This gives rise to the so-called "negative friction" whose value is proportional to the squared amplitude [4].…”