Which of the following provides evidence that there must be at least two types of electrical charge, but that there is only one type of mass?

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Which of the following provides evidence that there must be at least two types of electrical charge, but that there is only one type of mass?

 
 

A) The magnitude of the Coulomb's law constant differs greatly from the magnitude of the universal gravitational constant.

B) Contact forces such as friction are caused primarily by electrostatic forces and not by gravitational ones.

C) The electric force has a relative strength that is much greater than the strength of the gravitational force.

D) On the scale of the solar system, electric forces cancel out and gravitational forces dominate.
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