When air is replaced by a dielectric medium of constant K, the maximum force of attraction between two charges separated by distance d:
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When air is replaced by a dielectric medium of constant K, the maximum force of attraction between two charges separated by distance d:

G1 Physics · Accepted Answer

Step 1: In air F = q₁q₂/(4πε₀d²). Step 2: In a dielectric medium the permittivity becomes Kε₀. Step 3: F′ = F/K, so the force decreases by a factor K.