Calculate the electric field strength from a point charge and the electrostatic force between two charges using Coulomb's Law.
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Results
Electrostatic Force
13.481
N
Electric Field (from Q1)
4,493,750.00
N/C
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Formula
F = k × |q₁ × q₂| / r² (k = 8.9875×10⁹ N·m²/C²)
How to Use This Calculator
How to Use
- 1
Enter the first charge in microcoulombs (μC).
- 2
Enter the second charge in μC.
- 3
Enter the separation distance in meters.
- 4
Get force and field strength.
Frequently Asked Questions
Frequently Asked Questions
What does negative charge mean?
Negative indicates opposite polarity. Opposite charges attract; same charges repel. The force magnitude is the same either way.
What is Coulomb's constant?
k = 8.9875 × 10⁹ N·m²/C² (also written as 1/4πε₀). It defines the strength of electrical interactions.
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About This Calculator
This calculator uses the formula: F = k × |q₁ × q₂| / r² (k = 8.9875×10⁹ N·m²/C²). All calculations follow industry-standard methods. Results are estimates — always verify with a licensed professional for structural or code-compliant work.
Built and maintained by the CalcSmart team. Last updated March 2026.
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