1) between two charged plates, the electric field is given by E=U/d=F/Q->F=QE that means that the force on a particle between these two plates is independant on the position between them. But consider that you have two plates separated by a huge distance, then the force is constant wherever we place a charged particle between the plates. But if we use coulombs law and treat the plates as other charged particles we will get different results. How come? 2) in a plate? condensator we have C=eA/d (e=permitivity constant, d=distance, A=the plates area) we also have C=Q/U putting these equal to eachother gives: eA/d=Q/U -> Q/(eA)=U/d=E ie the electrical field, and the force on a prarticle in between the plates, is independant on the distance between the plates. I cant really get the logic in this one. for example lets say we have two charged plates with a distance of 1 cm from eachother, and then we move one plate away to the andromeda galaxy. That the force on a particle wherever in between these two plates still should be the same as with the distance of 1 cm is just absurd. Can someone explain these results? im only still in high school so I havent studied so much advanced physics. Is it maybe because the formula for the electric field is just an apporximation of the real world?