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I'm currently trying to calculate electric forces between two objects, so for that I of course need Coulomb's Law.

I understood its equation (etc.), but there are 3 things that I haven't found out yet:

-How exactly can you find out or calculate what amount of charge an object has?

-Does the amount of charge of an object have any unit?

-In the equation of Coulomb's law F12 = F21 = k*q1*q2/r² ,what exactly does the "k" stand for? I mean, what exactly is the number?