Same signs repel, opposite signs attract — and the force falls off with the square of the distance.
Field lines
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Options
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Presets
Like charges repel
Opposite attract
Double the distance
Strong pair
Charge q₁
+5.0 µC
Charge q₂
-4.0 µC
Separation r
0.80 m
Medium
Vacuum / air — εr = 1
Oil — εr ≈ 2.2
Glass — εr ≈ 5.5
Water — εr ≈ 80
Force F = kq₁q₂/(εr·r²)
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Nature
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Field at q₁
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Field at q₂
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Potential energy U
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Coulomb constant k
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