A _magnetic field_ is a region in space where moving electric charges or magnetic materials experience a force. It is generated by electric currents, such as those in electromagnets, or by intrinsic properties of particles, like the [[Spin|spin]] of electrons. Magnetic fields are closely related to [[Electric Field|electric fields]] through [[Electromagnetism|electromagnetism]]. A changing electric field can create a magnetic field, and vice versa, as described by Maxwell’s equations (some of the few sets of equations all physicists had to learn by heart at least once). Together, they form electromagnetic waves, such as light. In quantum physics, magnetic fields play a fundamental role in phenomena such as the Zeeman effect, where [[Energy Level|energy levels]] of [[Atom|atoms]] split under an external magnetic field, and in quantum Hall effects, which arise in two-dimensional [[Electron|electron]] systems at low temperatures and strong magnetic fields. Magnetic fields are also crucial in [[Quantum Computer|quantum computing]] and [[Quantum Metrology|metrology]]. [[Platform - Superconducting Circuits|Superconducting qubits]] rely on precisely controlled magnetic fields, and techniques like nuclear magnetic resonance (NMR) use them to manipulate quantum states. Advances in quantum sensors enable extremely precise measurements of weak magnetic fields, with applications ranging from medical imaging to fundamental physics experiments. >[!read]- Further Reading >- [[Electromagnetism]] >- [[Electromagnetic Wave]] >- [[Electric Field]] >[!ref]- References