免费库仑定律计算器
使用库仑定律计算两个点电荷之间的静电力。
C
C
m
Electrostatic Force
7.1900 N
Electrostatic Force vs Charge 1
公式
Coulomb's Law
Coulomb's law gives the magnitude of the electrostatic force between two point charges.
Formula
F = k * q1 * q2
where k = 8.9875 x 10^9 N·m²/C². Like charges repel, unlike charges attract.
计算示例
Two charges (1 μC and 2 μC) separated by 5 cm.
- 01F = k * |q1 * q2| / r²
- 02F = 8.9875e9 * |1e-6 * 2e-6| / 0.05²
- 03F = 8.9875e9 * 2e-12 / 0.0025
- 04F = 0.01798 / 0.0025 = 7.19 N
常见问题
How is Coulomb's law similar to Newton's gravitational law?
Both are inverse-square laws. However, gravity is always attractive, while the electric force can attract or repel. The electric force is vastly stronger than gravity.
What is Coulomb's constant?
k = 8.9875 x 10^9 N·m²/C², also written as 1/(4*pi*epsilon_0) where epsilon_0 is the permittivity of free space.
Does the medium between charges matter?
Yes. In a medium with relative permittivity (dielectric constant) kappa, the force is reduced by a factor of kappa.
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