1. What is the Electric Field Equation?

The electric field equation describes the electric force per unit charge at any point in space. It's a fundamental concept in electromagnetism that helps understand how charges interact with each other.

2. How Does the Calculator Work?

The calculator uses the electric field equation:

Where:

• \( E \) — Electric field strength (N/C)
• \( k \) — Coulomb's constant (8.98755×10⁹ N·m²/C²)
• \( Q \) — Source charge (C)
• \( r \) — Distance from the charge (m)

Explanation: The equation shows that electric field strength decreases with the square of the distance from the source charge and is proportional to the magnitude of the charge.

3. Importance of Electric Field Calculation

Details: Calculating electric fields is essential for designing electrical systems, understanding electromagnetic phenomena, and solving problems in electrostatics and electronics.

4. Using the Calculator

Tips: Enter charge in coulombs, distance in meters, and Coulomb's constant (default value is pre-filled). Distance must be greater than zero.

5. Frequently Asked Questions (FAQ)

Q1: What is the direction of the electric field?
A: The field points away from positive charges and toward negative charges. This calculator gives the magnitude only.

Q2: What are typical electric field values?
A: Near a point charge, fields can be very strong (thousands of N/C). Earth's natural field is about 100-150 N/C downward.

Q3: How does the field change with multiple charges?
A: For multiple charges, calculate each field separately and vector sum them.

Q4: What's the difference between E and F?
A: E is field strength (N/C), while F is force (N) on a test charge q (F = qE).

Q5: Why is distance squared in the equation?
A: This reflects the inverse-square law nature of electric forces - field strength diminishes with the square of distance.