Electric Field Calculator – E = kQ/r²
Calculate electric field strength from charge and distance using E = kQ/r².
How It Works
Enter the source charge Q in Coulombs and the distance r in meters. The calculator returns electric field strength E in N/C (Newtons per Coulomb), equivalent to V/m.
Formula
E = k × Q ÷ r²
Frequently Asked Questions
What is electric field strength?
Electric field E describes the force per unit charge at a point in space. E = F/q, or equivalently E = kQ/r² for a point charge.
What are typical electric field values?
Earth's atmosphere: ~100 V/m. Inside a capacitor: 10⁶ V/m. Atomic electric fields: ~10¹¹ V/m.