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  4. The ratio of the force between two charges in vacuum at a certain distance apart to that between the same charges, the same distance apart in a medium of permittivity ε is :

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Q. The ratio of the force between two charges in vacuum at a certain distance apart to that between the same charges, the same distance apart in a medium of permittivity $\varepsilon$ is :

Electrostatic Potential and Capacitance

Solution:

$F_{vocuum} / F_{medium} = \varepsilon_r = \varepsilon / \varepsilon_0$