I was going over my elecro statics course and in a textbook it gave an explanation on how molecules in a dielectric are polarised when placed in an external electric field.
They seem to be saying the electric field increases the separation between the postive and negative charges until its balanced by the attractive force between the charges. What force increases in strength when the seperation increases?
My understanding is the couloumb force is keeping the electron bound to the positively charged nucleus. I agree that in an external field they will recieve opposite forces and try to seperate but if the distance between the electron and the nuceleus increases, the couloumb interaction between them weakens. How can they settle to a new equlibrium?
Where is my misunderstanding?