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What is force of repulsion between two charges of 1C each kept at 1m apart in water.{K=80}.
Just apply Coulumb's Law. The force gets divided by the value of dielectric constant(here k=80), due to the properties of the medium.
From the colomb's law,
F=q1xq2/4∏εKr2
Substituting values,
F=1/320∏ε
F=1.1x109
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