well then it should be simple.
the gravitational pull between objects of any size should be equal to the electrostatical pull between objects of any similar size.
this can be tested in your kitchen.
wave your hand slowly over some A4 paper and see how the paper reacts.
and then unroll some cling film and do the same thing.
if gravity and electrostatic effects are the same thing, the comparatively weighty paper will be more attracted to your hand than the plastic.
but if the electrostatic effect is different from gravity, the paper will be less attracted to your hand.
let me know how the experiment goes.
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