Electric Field Calculator

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Pick the situation you have. Each mode uses the same field idea with different known quantities.
The charge creating the field. Use a negative value for a negative charge, the field then points toward it.
Distance from the charge to the point where you want the field.
Dielectric constant of what surrounds the charge. Vacuum and air ≈ 1, water ≈ 80, glass ≈ 5. A higher value weakens the field.
Electric fieldWeak, gentle field, well below anything hazardous
899 N/C

Field magnitude with sign where it applies. Positive points away from a positive charge, negative toward it.

Field (numeric, N/C)899N/C
Equivalent in volts per metre899V/m

The electric field is 899 N/C.

  • The field follows the inverse-square law: E = k·q ÷ r², so doubling the distance cuts the field to a quarter.
  • The field here points radially away from the charge (it is positive).
  • In vacuum or air (εᵣ ≈ 1) Coulomb’s constant k = 8.99 × 10⁹ sets the scale, even a nanocoulomb makes a sizeable field up close.

Next stepMultiply this field by any test charge q to get the force it would feel: F = q·E.

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