Calculate the magnitude of the electric field at a distance from a single point charge.
Charge & Distance
Field Strength Results
Enter charge and distance (scientific notation supported)
About this calculator
Quick Reference
k8.99 × 10⁹ N·m²/C²
qPoint charge magnitude
rDistance from charge
EElectric field strength
Overview
An electric field is a physical field that surrounds electrically charged particles. The field exerts force on other charged particles within the field.
💡
Pro Tips
Formula: E = k * q / r².
The value of Coulomb's constant (k) is approximately 8.99 × 10⁹ N·m²/C².
Positive charges create fields that point away from them, while negative charges create fields that point toward them.
!
Fun Facts
"The electric field strength follows the inverse square law, just like gravity."
"The SI unit for electric field is Newtons per Coulomb (N/C) or Volts per meter (V/m)."
"At very small distances, the electric field strength can become incredibly large."
