Electric Field Calculator

Calculate the field strength from a point charge at a given distance

Calculator Options

Quick Examples
1 nC at 0.1 m 2 μC at 0.5 m 1 C at 10 m

Results

Equation Used:

E = k·|q|/r²

E = (8.99×10⁹ N·m²/C²) × |0.001 C| / (0.1 m)²

Electric Field vs Distance
Example Calculations
Charge (q) Distance (r) Electric Field (E)
2 μC 0.5 m 71,920 N/C
-1 nC 0.1 m 899 N/C
1 C 10 m 89,900 N/C

How to Use This Calculator

  1. Enter the charge value in the input field (can be positive or negative).
  2. Select the appropriate unit for the charge (C, mC, μC, or nC).
  3. Enter the distance from the charge in the distance field (must be positive).
  4. Select the distance unit (m, cm, or mm).
  5. The electric field strength will be calculated automatically and displayed.
  6. Optionally view the graph showing how field strength varies with distance.

Concept Summary

Term Definition
Electric Field (E) The force per unit charge exerted on a small positive test charge.
Point Charge (q) An idealized charge located at a single point in space.
Distance (r) Distance from the charge to the point where the field is measured.