Is there any evidence that suggests there can be more than just positive and negative particles
None, unless you're thinking of neutral particles with zero charge - there are plenty of those.
Quarks have something called "color charge". There are three kinds, labelled red,green,blue.
How are neutral particles with zero charge created?
What would be the result of a protron and a electron combining inside the particle
Either a hydrogen atom (the most common case of combining a proton and an electron) or by electron capture, a neutron. Both are neutral.
There are only positive (e.g. proton, up quark), negative (e.g. electron, down quark) and neutral (e.g. neutron, neutrino) electromagnetic charges.
What other options could there be? You'd have to start talking about vectors.
But is there any kind of evidence that suggests that there might be diffrent types of charges if it were in a diffrent electro magnetic feild
Well, particles have colour charges which interact in the strong field.
But in electromagnetism, the electromagnetic charge is what dictates how the particle moves in the electromagnetic field.
For the electro-magnetic interaction, there is only the one type of charge, which is positive or negative. Neutrons are composites of charged quarks, which add up to 0 net charge.
For other types of forces, there are values that act like charge but aren't the same thing. For gravity, there is gravitational mass, which functions the same way, except it is always positive. As others have mentioned, quarks also interact through the Strong Force, which has multiple types of 'color charge'.
There is only one EM field and it only has + and - charges. We can't talk about "different" EM fields since they don't exist.
Do you mean we cant talk about it on this forum because it is against the rules
Well, yes, but what I really mean is that the EM field has been observed to have these particular rules. Another field with different rules would not be an EM field. Even slightly modifying the current EM field would result in another field, not our own EM field. So when you ask about "different" EM fields it's like asking what would the weather be like on another Earth. Well, there's only one Earth so the question doesn't make much sense.
We could easily come up with different rules for another field. Perhaps our imaginary field has thirty-seven different types of charges, but since the field doesn't really exist we haven't really gotten anywhere, have we?
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