Electricity & Magnetism formula sheet

48 rows · 6 sections · PhysRef · sample of the first 6 rows

Electricity & Magnetism formula sheet. Every electricity & magnetism equation in PhysRef on one sheet — 48 formulas across 6 topics, each with its equation set in real maths, a symbol key and the SI unit of every symbol.
Quantity	Equation	Symbols	SI units
Electrostatics
Coulomb's Law	$F = k\frac{q_1 q_2}{r^2}$	F = electric force · k = coulomb constant · q₁ = charge 1 · q₂ = charge 2 · r = distance	F: kg·m/s² · k: kg·m³/(A²·s⁴) · q₁: A·s · q₂: A·s · r: m
Electric Field	$E = \frac{F}{q} = k\frac{Q}{r^2}$	E = electric field · F = force · q = test charge · Q = source charge · r = distance	E: kg·m/(A·s³) · F: kg·m/s² · q: A·s · Q: A·s · r: m
Electric Potential	$V = k\frac{Q}{r}$	V = electric potential · k = coulomb constant · Q = source charge · r = distance	V: kg·m²/(A·s³) · k: kg·m³/(A²·s⁴) · Q: A·s · r: m
Electric Potential Energy	$U = k\frac{q_1 q_2}{r} = qV$	U = potential energy · k = coulomb constant · q₁ = charge 1 · q₂ = charge 2 · r = distance · q = charge · V = potential	U: kg·m²/s² · k: kg·m³/(A²·s⁴) · q₁: A·s · q₂: A·s · r: m · q: A·s · V: kg·m²/(A·s³)
Uniform Electric Field	$E = \frac{V}{d}$	E = electric field · V = potential difference · d = distance	E: kg·m/(A·s³) · V: kg·m²/(A·s³) · d: m
Gauss's Law	$\oint \vec{E} \cdot d\vec{A} = \frac{Q_{enc}}{\varepsilon_0}$	∮E·dA = electric flux · Q_enc = enclosed charge · ε₀ = permittivity	∮E·dA: kg·m³/(A·s³) · Q_enc: A·s · ε₀: A²·s⁴/(kg·m³)

Built from the 48 electricity & magnetism entries in the PhysRef reference, grouped by the topics that category page uses. Every equation here is free to read on its own page at /formulas.

Every row on this sheet is also free on its own page — browse the Electricity & Magnetism formulas. Premium pays for the sheet, not the physics.