⚡ Coulomb's Law — how q, r and the medium set the force
Change either charge, the separation, or the medium. Both arrows are always equal and opposite — Newton's third law holds for the electric force too.
Walkthrough
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Step 1 — two charges, nothing else. Note their signs and how far apart they are.
Charge q₁
+3.0 µC
Charge q₂
−2.0 µC
Separation r
0.30 m
Medium ε
r
1.0
F =
0.60
N ·
attractive
r =
0.30
m · ε
r
=
1
double r → F falls to
¼
water (ε
r
= 80) cuts F to
1.25%
Animation speed
1.0×
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