How to use the electric field of a point charge calculator
Find electric field strength and potential at a distance from a charge. Enter charge, distance in the fields above; the electric field, electric potential are computed instantly and plotted on the chart so you can see how the answer changes.
Formula
Variables
- q — Charge (nC)
- r — Distance (m)
Worked example
With charge = 10 nC, distance = 0.3 m, the calculator gives electric field ≈ 998.6169 N/C; electric potential ≈ 299.5851 V.
Frequently asked questions
What is the formula for the electric field of a point charge calculation?
Electric field (N/C) = KE × q × 1e-9 / (r × r). Electric potential (V) = KE × q × 1e-9 / r. Here q is charge (nC), r is distance (m).
What inputs do I need for the electric field of a point charge calculator?
You need charge in nC, distance in m. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use this calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.