if we wrap a charge by an insulator, is there a methord to come to know about the charge placed inside??
a square insulating sheet of side A and charge density 
are placed in a vaccum .how can we find out the electric field at a distance x.
but if the sheet is a conductor, then what will be the scenario....
and also if electric field is inversely proportional to r^3 then will the gauss laws be valid
plz explain
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