How it works
Signed interaction F = k q₁q₂/r² with k ≈ 8.9875517923×10⁹ N·m²/C². Positive indicates repulsion.
Input definitions
- First charge (C)
- Enter the value in the labeled unit.
- Second charge (C)
- Enter the value in the labeled unit.
- Separation (m)
- Enter the value in the labeled unit.
A worked example
- First charge (C)
- 0.000001
- Second charge (C)
- 0.000002
- Separation (m)
- 0.1
Assumptions & limits
Ideal educational model in the stated SI units. Real equipment, structural design and safety decisions need appropriate professional analysis; losses are excluded unless entered.
Sources & review
Maintained by AnsRio. Methods and examples use automated checks; this does not imply independent professional certification.
Method updated 2026-10-18. Content checked against the stated method and examples. Our verification approach.
Common questions
What does a negative force mean?
Unlike signed charges produce attraction; like signed charges repel. This scalar sign describes interaction type, not a complete vector direction.
How does Coulomb electrostatic force work?
Signed interaction F = k q₁q₂/r² with k ≈ 8.9875517923×10⁹ N·m²/C². Positive indicates repulsion.
What should I check before using Coulomb electrostatic force?
Ideal educational model in the stated SI units. Real equipment, structural design and safety decisions need appropriate professional analysis; losses are excluded unless entered.