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[Phys-L] inductors cutset and condenser loops, previous and initial conditions.



I do not understand the physics regulating these kinds of circuits.

Could anyone help me?

In an electrical circuit formed by resistors, inductors, capacitors, and
sources, if you have two separate parts connected only by inductors and
current sources you have an "inductors cutset", (a generalization of a
series of inductors). If you have a loop of condensers and voltage sources
you have a generalization of parallel condensers.

My problem is with "previous" and "initial" conditions.

If you say in previous conditions, that in an inductor cutset the sum of
currents is different from zero, you will be in contradiction to the
current Kirchoff law. In a condenser loop it is the same with gorges
distribution between condensers and voltage Kirchoff law.

So assume you have open condensers an closed inductors, with previous
conditions, and you open simultaneously all the inductors and connect all
the condensers ¿what is the initial distribution of currents and gorges? (A
thing to explore is what happens if you open and close them in different
orders.)


¿What is the physics that apply?.

I can assume that in a loop, only one value of charge could move in all the
loop, without affecting the other connected parts, so there is only one
distribution of gorges that could satisfy Kirchoff law and condensers law.

In a cutset I can assume that the two parts of the circuit change "globally"
the difference in voltage in each branch of the cutset, going each as a
whole. In that case I can assume something similar with inductors flux as
in condensers gorges.

But I am using a simulation program and, in that condition, it puts all the
current in the first inductor and all the gorges in the last (listed)
condenser, so if I change the order of elements in the data input, the
simulations goes different.

Perhaps the solution is as the simulation program suggests: undetermined, and
there is no physics that could specify unique initial conditions, other
than construct a better model (circuit).


Thank you very much!


--
Diego Saravia
Diego.Saravia@gmail.com
NO FUNCIONA->dsa@unsa.edu.ar