Ok let us take an example of a book placed on a table and in first case let us say that it is on an aeroplane at rest. Since the book is at rest this means that the weight is balanced by the normal of the table.
But if the same ( book + table ) system is kept on a flying aeroplane (in horizontal direction with constant speed )at a great height ( comparable to earth's radius), then the weight of the body will be decreased but it is still at rest. This again means that the weight is balanced by the normal of the table. This means that the normal force has decreased in order to balance the weight.
But since normal force is the electric force , so why and how does the electric force decreased without altering the distance between the charges in the book and the table ??