Ferrofluid Valve Operated By the Magnetic Field of a Straight Current-carrying Wire

Comparing a current-carrying circular wire with polygons of equal perimeter: Magnetic field versus magnetic flux

Green’s Function for a Neutron in Interaction with a Straight Current Carrying Wire

We construct an integral representation for the momentum space Green’s function for a Neutron in interaction with a straight current carrying wire. PACS numbers: 11.30.Pb, 03.65.Fd, 11.10.Ef ∗This research was supported in part by the Brazilian Research Agencies CNPq and Finep. 1 Consider an electrically neutral spin 1/2 particle of mass M and a magnetic moment μ~σ (a Neutron) in interaction wi...

Charge Density in a Current-Carrying Wire

Discussions of the force on a charged particle outside a current-carrying wire often assume that the wire is electrically neutral. This problem explores how this assumption is not quite correct. We give solutions both in the lab frame and in the rest frame of the conduction electrons, using both Maxwell’s equations and special relativity. We note that for current to flow in a resistive wire, th...

Electron Holography of the Magnetic Phase Shift of a Current-Carrying Wire

The controlled generation of magnetic fields to study switching processes in magnetic materials in the transmission electron microscope (TEM) is highly challenging [1-3]. Here, we use electron holography to study the magnetic field around a carefully fabricated current-carrying wire. As a result of the fact that a current flowing parallel to the plane of an untilted TEM specimen produces no net...

The Electric Field Outside a Stationary Resistive Wire Carrying a Constant Current

We present the opinion of some authors who believe there is no force between a stationary charge and a stationary resistive wire carrying a constant current. We show that this force is different from zero and present its main components: the force due to the charges induced in the wire by the test charge and a force proportional to the current in the resistive wire. We also discuss briefly a co...