Poloidal magnetic field
= Poloidal magnetic field
{title2=$\mathbf B_p=B_R\mathbf e_R+B_z\mathbf e_z$}
A poloidal <magnetic field> lies in meridional planes through the symmetry axis, in contrast to a <toroidal magnetic field>. For an <axisymmetric vector field>, it is represented by a <poloidal magnetic flux function> as $\mathbf B_p=R^{-1}\nabla\Psi\times\mathbf e_\phi$.