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Re: definition of a particle?
The gauss law definition of a particle won't hold for neutral ones.
The electrical feild is defined that way so that it becomes totally rigid. However, we can imagine it to be a property of that portion of space... And it's induced by the presence of particles with special properties nearby.
We merely simplify it by calling these nearby particles as 'charged'. However, if there is merely one charged particle in the entire universe, there is no significance of this concept. So, the test charge thing is just a process of clearing it up.
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ronthepon, capitals avoided. 
And don't ask me why. |
