1. What is Coulomb's Law for Repulsive Force?

Coulomb's Law describes the electrostatic interaction between electrically charged particles. For two charges with the same sign, the force is repulsive, pushing the charges away from each other.

2. How Does the Calculator Work?

The calculator uses Coulomb's Law equation:

Where:

• \( F \) — Repulsive force (newtons)
• \( k \) — Coulomb's constant (8.98755×10⁹ N m²/C²)
• \( q_1 \) — First charge (coulombs)
• \( q_2 \) — Second charge (coulombs)
• \( r \) — Distance between charges (meters)

Explanation: The force is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.

3. Importance of Repulsive Force Calculation

Details: Calculating repulsive forces is essential in electrostatics, electrical engineering, and physics research. It helps understand charge interactions, design electrical systems, and predict particle behavior.

4. Using the Calculator

Tips: Enter Coulomb's constant (typically 8.98755×10⁹), both charges in coulombs, and distance in meters. All values must be positive numbers.

5. Frequently Asked Questions (FAQ)

Q1: What is the standard value of Coulomb's constant?
A: The standard value is approximately 8.98755×10⁹ N m²/C², which is often rounded to 9×10⁹ for calculations.

Q2: Do both charges need to be positive for repulsive force?
A: Repulsive force occurs when both charges have the same sign - either both positive or both negative.

Q3: How does distance affect the repulsive force?
A: The force decreases with the square of the distance. Doubling the distance reduces the force to one-quarter.

Q4: What are typical charge values used in calculations?
A: Elementary charge is about 1.602×10⁻¹⁹ C. Macroscopic charges are typically in microcoulombs (10⁻⁶ C) to millicoulombs (10⁻³ C).

Q5: Can this calculator be used for attractive forces?
A: For attractive forces (opposite charges), the calculation is the same but the force value will be negative, indicating attraction.