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Electrostatics formulas
16 formulas for Electrostatics, from the Physics — Formulas section of the Quantix formula library. Tap 🧮 next to a formula to solve it for any variable with step-by-step working.
| Name | Formula | Note |
|---|---|---|
| Coulomb's law | F = kq₁q₂/r², k = 1/(4πε₀) 🧮 Solve step by step | N |
| Electric field | E = F/q = kq/r² 🧮 Solve step by step | N/C |
| Electric potential | V = kq/r 🧮 Solve step by step | V |
| Field–potential relation | E = −dV/dr | |
| Potential energy (two charges) | U = kq₁q₂/r 🧮 Solve step by step | J |
| Dipole moment | p = q × 2a 🧮 Solve step by step | C·m |
| Torque on dipole | τ = pE sin θ 🧮 Solve step by step | |
| Gauss's law | ∮E·dA = q_enc/ε₀ | |
| Infinite line charge | E = λ / (2πε₀r) 🧮 Solve step by step | |
| Infinite plane sheet | E = σ / (2ε₀) 🧮 Solve step by step | |
| Capacitance | C = Q/V 🧮 Solve step by step | F |
| Parallel-plate capacitor | C = ε₀A/d (× K with dielectric) | F |
| Spherical capacitor (isolated sphere) | C = 4πε₀R 🧮 Solve step by step | |
| Capacitors in series | 1/C = 1/C₁ + 1/C₂ + … | |
| Capacitors in parallel | C = C₁ + C₂ + … | |
| Energy stored | U = ½CV² = Q²/2C 🧮 Solve step by step | J |
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