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Coulomb's Law Force Calculator
AP Physics 2 · Unit 10 Electrostatics
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Learning Objectives
Calculate electrostatic force: F = kq₁q₂/r²
Understand inverse-square relationship
Predict attractive vs repulsive force
Compare Coulomb's law with gravitational force
Key Equations
F = k|q₁q₂|/r²
k = 8.99×10⁹ N·m²/C²
Like charges → repel
Unlike charges → attract
Tags
Coulomb's Law
electrostatics
electric force
AP Physics 2
|F|
0 N
Type
Repulsive
Charge 1
q₁ (μC)
+3.0
Charge 2
q₂ (μC)
-2.0
Distance r (cm)
5.0
Results
|Force|
0
Direction
—
q₁·q₂
0
F (vs gravity)
—
F vs r Graph
Quick Quiz
If the distance between two charges is tripled, the force becomes:
1/9 as strong
1/3 as strong
3× stronger
9× stronger