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physics.class-ph2026
A Magnetic Torsional Pendulum for Exploring Forced Resonance, Parametric Resonance, and Parametric Amplification
Wenqing Xie, Jiahao Wu, Yujun Shi
We present a magnetic torsional pendulum that provides a unified experimental platform for investigating forced resonance, parametric resonance, and degenerate parametric amplifica…
physics.class-ph2025
Revisiting Koehler's experiment of measuring the ratio of the specific heats of air by self-sustained oscillations
Yujun Shi, Xiaoting Fen
We revisit Koehler's experiment, a clever modification of Ruchardt's experiment designed to measure the ratio of specific heats of gas. However, the lengthy and dense analysis shar…
physics.class-ph2025
Geometric invariance from outer surfaces: Laplace-governed magnetization in the high-permeability limit
Yujun Shi
The magnetization of bodies in static fields is a textbook topic in electrodynamics, governed by Laplace equations with interface continuity (transmission) conditions. In the infin…