The electric force between two charges kept at a distance r i air is f
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The electrostatic force between the to point chages depends inversely upon the permittivity of meium,ehih is a medium constant
permittivity is the least for air/acum,so the electrostatic force will be greatest in air.and decrease in other meiums
Fm=Fair/K
Dielectric constant of water = 80.
The force would be reduced by a factor of 80.
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