---
tags:
  - science/physics
  - phenomena
  - electromagnetism
created: 2026-05-16
breadcrumb: "Physics > Natural phenomena > Electricity & magnetism"
---

# Electricity & magnetism

> **Mechanism:** Charge, current, and the EM field

## Items

- **Coulomb's law** — F = k q₁q₂ / r². Charges of like sign repel, unlike attract.
- **Current** — I = dQ/dt. Conventional current direction is opposite to electron flow.
- **Ohm's law** — V = IR. Holds for ohmic conductors.
- **Lorentz force** — F = q(E + v × B). Foundation of motors, generators, mass spectrometers.
- **Induction** — A changing magnetic flux through a loop induces an EMF. ε = −dΦ/dt.

## Related

- [[maxwells-equations-overview]]
- [[radio-microwave-thz]]