two equal like charges in air repel each other with a force F by what parcentage should each charge be - Physics - Electricity

Question

two equal like charges in air repel each other with a force F by
what parcentage should each charge be reduced so that the force
between them in a medium of k=2 reduced by 28%

Shashank Damera · Answer

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two equal like charges in air repel each other with a force F.by what parcentage should each charge be reduced so that the force between them in a medium of k=2 reduced by 28%