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force on the elctric due to the plates is qE

and E = [itex] \sigma/epsilon_{0} [/itex]

force of gfravity is mg

so [tex] \sigma = \frac{mg\epsilon_{0}}{q} [/tex]

and this is the surface charge density on the plates, isn't it ?

Does the distnace (which does NOT appear on the formula and is totally irrelevant i think) matter?

Please do advise on this matter!

Thank you!