Electric Field Calculator
Electric Field Calculator
| Quantity | Value |
|---|---|
| Charge Q | 1.00 µC |
| Distance r | 0.500 m |
| Coulomb Constant k | 8.99 × 10⁹ N·m²/C² |
| Electric Field E | 3.60e+4 N/C |
| Field (V/m) | 3.60e+4 V/m |
| Electric Potential V | 1.80e+4 V |
| Force on 1 C Test Charge | 3.60e+4 N |
Field Strength vs Distance
Inverse-square: doubling r quarters the field
About the Electric Field Calculator
Coulomb's law gives the field of a point charge: E = kQ/r², with k = 8.99 × 10⁹ N·m²/C². A 1 µC charge at 0.5 m produces E = 8.99×10⁹ × 10⁻⁶ ÷ 0.25 ≈ 35,960 N/C — strong enough to visibly move a small test charge. The potential at the same point is V = kQ/r ≈ 17,980 V.
The Inverse-Square Shape
Halve the distance and the field quadruples; double it and the field drops to a quarter. This steep falloff is why electrostatic forces dominate at atomic scales but vanish over everyday distances — and why shielding and grounding are practical.
Frequently Asked Questions
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