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Coulomb's constant is defined as a value for attraction and repulsion.However, it is strange that only one value can be applied for both attractionand repulsion. A very little difference between coulomb's constant forattraction and coulomb's constant for repulsion can be the source of gravity.The author verified if that theory is correct by calculating with slightlybigger coulomb's constant for attraction.

Gravity can be caused by the difference of Coulomb's constants