Is electrostatic force is by gravitational force? why and why not?
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Electrostatic force is NOT medium dependent. The force between two unit charges at a given distance is always the same, irrespective of the surroundings, and is given by the Coulomb's law (with constant ϵ0ϵ0). When you put charges inside a medium like water/oil, the medium around gets polarized, and the new field created due to this acts on the charges inside it. That's why is looks as if there was an "apparent" change in force between charges as compared to when they were in vacuum.
Since there is no concept of gravitational poles in any of the well known theories on gravity, we don't see any similar polarization effect.
Since there is no concept of gravitational poles in any of the well known theories on gravity, we don't see any similar polarization effect.
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The concept of charge arises from an observation of nature: We observe forces between objects. ... Electric forces are very large, far greater than the force of gravity. Unlike gravity, there are two types of electric charge, (whereas there is only one type of gravity; gravity only attracts)
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