Abstract
We consider a planar pendulum with an oscillating suspension point and with the bob carrying an electric charge $$q$$ . The pendulum oscillates above a fixed point with a charge $$Q.$$ The dynamics is studied as a system in the small parameter $$\epsilon$$ given by the amplitude of the suspension point. The system depends on two other parameters, $$\alpha$$ and $$\beta,$$ the first related to the frequency of the oscillation of the suspension point and the second being the ratio of charges. We study the parametric stability of the linearly stable equilibria and use the Deprit – Hori method to construct the boundary surfaces of the stability/instability regions.
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