magnetic vector potential
21Solenoidal vector field — In vector calculus a solenoidal vector field (also known as an incompressible vector field) is a vector field v with divergence zero at all points in the field; The fundamental theorem of vector calculus states that any vector field can be… …
22Retarded potential — The scalar or vector potential electromagnetic of a time varying current or charge distribution.These are the electromagnetic retarded potentials for an arbitrary source in free space (vacuum). They satisfy the inhomogeneous wave equations for… …
23Earth's magnetic field — Computer simulation of the Earth s field in a normal period between reversals.[1] The tubes represent magnetic field lines, blue when the field points towards the center and yellow when away. The rotation axis of the Earth is centered and… …
24Electric potential energy — Electromagnetism Electricity · …
25Poynting vector — In physics, the Poynting vector can be thought of as representing the energy flux (in W/m2) of an electromagnetic field. It is named after its inventor John Henry Poynting. Oliver Heaviside independently co discovered the Poynting vector. In… …
26Force-free magnetic field — A force free magnetic field is a type of field which arises as a special case from the magnetostatic equation in plasmas. This special case arises when the plasma pressure is so small, relative to the magnetic pressure, that the plasma pressure… …
27Membrane potential — Differences in concentration of ions on opposite sides of a cellular membrane lead to a voltage called the membrane potential. Many ions have a concentration gradient across the membrane, including potassium (K+), which is at a high inside and a… …
28Quantitative models of the action potential — In neurophysiology, several mathematical models of the action potential have been developed, which fall into two basic types. The first type seeks to model the experimental data quantitatively, i.e., to reproduce the measurements of current and… …
29Maxwell's equations — For thermodynamic relations, see Maxwell relations. Electromagnetism …
30Mathematical descriptions of the electromagnetic field — There are various mathematical descriptions of the electromagnetic field that are used in the study of electromagnetism, one of the four fundamental forces of nature. In this article four approaches are discussed. Contents 1 Vector field approach …
