**Suppose** i have the following system of 4 different charges and different masses arranged at the corner of the square and i know the initial electrostatic energy of the system, and i want to know the speeds of individual charges when the system expands due to electrostatic repulsion uptill **infinity** (all charges free to move)

**Is that possible?** i feel that energy and momentum conservation are just not giving enough equations,, and even taking angular momentum about **com** does'nt seem to make it any easier either,,, infact what i basically fail to **understand** is how to find in what ratio the net electrostatic energy of the system is distributed among them as they move to infinity,

It is easier if they were like charges.,, which is a common question, but this seems harder,, **impossible**,,

But nothings supposed to have an infinite number of solutions in physics,, there should be a definite speeds with which each particle should end up with,, what am i **missing**?

I request any one with the knowledge i seek to enlighten me regarding this with proper explanation hopefully through some **math**.

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TopNewestWhich book do you practice physics problems from?Any advanced book?

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No advanced book, i think that if properly done, DC pandey , HC verma and iridov are just enough,, after that it depends on the person as to how creative he/she can be when solving physics problems, Brilliant is really helpful,, i just randomnly collect problems wherever available,

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Hey saketh I think here we need the concept of

reduced mass. I have feeling about that but Since I didn't study this concept yet so can't able to help you. May be I'am wrong but i just share my views.Log in to reply

It is a numerically indeterminate problem.You can write the acceleration of each particle as a function of the distance between the other four particles. And we will get a set of second order differential equations which cannot be solved. But i am sure if you enter this system in a computer simulation you will get a solution for the velocities. I had a similar doubt . Consider a rod resting on a rough wall and a rough floor in equilibrium at some given angle. you cannot determine the friction normal , etc. anywhere because you dont have sufficient equations.

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