如何计算Coulombs Law
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Coulomb's Law quantifies the electrostatic force between two charged particles. It states that the force is proportional to the product of the charges and inversely proportional to the square of the distance between them.
公式
The calculator applies F = k × |q₁ × q₂| / r² where k is Coulomb\'s constant
- F
- k × |q₁ × q₂| / r² where k is Coulomb\'s constant — k × |q₁ × q₂| / r² where k is Coulomb\'s constant
分步指南
- 1Input the magnitudes of two electric charges and the distance between them
- 2The calculator applies F = k × |q₁ × q₂| / r² where k is Coulomb's constant
- 3Results show the electrostatic force in Newtons
例题解析
输入
q₁ = 2 μC, q₂ = 3 μC, r = 0.5 m
结果
F ≈ 0.216 N
Using k = 8.99 × 10⁹ N·m²/C²
常见错误注意事项
- ✕Forgetting to square the distance in the denominator
- ✕Using distance in centimeters instead of meters, which affects calculation accuracy
常见问题
Why does force decrease with distance squared?
The electric field spreads spherically in three-dimensional space, so its strength decreases with the inverse square of distance.
Can this law handle opposite charges?
Yes, opposite charges experience attractive force (negative) while like charges experience repulsive force (positive).
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