Magnetic field line
= Magnetic field line
A magnetic field line is an integral curve tangent to the <magnetic field>. In coordinates $x^i$, it obeys $dx^i/B^i=dx^j/B^j$ wherever the relevant components are nonzero.
= Magnetic field line
A magnetic field line is an integral curve tangent to the <magnetic field>. In coordinates $x^i$, it obeys $dx^i/B^i=dx^j/B^j$ wherever the relevant components are nonzero.