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2) Let us go to a simple case of static stable equilibrium. I am
thinking about an equal-arms balance. The center of mass of the
suspended frame is below the point of suspension. The weight indicator
is vertical when two weights are equal. Put an extra weight, dW, on one
of the plates and the indicator shifts accordingly. Here many
equilibrium positions are possible, one for each dW. In the ideal case
this is an example of a "stable system." Suppose we begin with dW=0;
this is one equilibrium position. We disturb the system, by adding a
dW, and a new tilt of the indicator is established, perhaps after some
oscillations. Here the term "stable" is used to say that the original
orientation is recovered when the disturbance is removed.
I was not aware that the term "dynamic equilibrium," implies that the
same is true for a planet orbiting the sun. That is why I removed it.
In the first sentence of your reply (see above) you are saying that my
electrical "system is highly unstable." The same is true for our
solar system. Is this what you have in mind? If so then I agree.
To avoid possible confusion I will start using the term "durable,"
instead of "stable" or "dynamically stable." But I suspect you have
something different in mind. Perhaps you think that, unlike a solar
system, my electric system will not be durable. If so then please
explain. Keep in mind that my model ignores gravitational forces and
emission of electromagnetic waves.