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A magnetic circuit is made up of one or more closed loop paths containing a magnetic flux. The flux is usually generated by permanent magnets or electromagnets and confined to the path by magnetic cores consisting of ferromagnetic materials like iron, although there may be air gaps or other materials in the path.
In electromagnetism, an eddy current (also called Foucault's current) is a loop of electric current induced within conductors by a changing magnetic field in the conductor according to Faraday's law of induction or by the relative motion of a conductor in a magnetic field. Eddy currents flow in closed loops within conductors, in planes ...
Such loops in the ground path can cause currents in signal cable grounds by two main mechanisms: Ground loop current induced by stray AC magnetic fields (B, green) Ground loop currents can be induced by stray AC magnetic fields [5] [7] (B, green) which are always present around AC electrical wiring. The ground loop constitutes a conductive wire ...
The small loop antenna is also known as a magnetic loop ... a typical radiation efficiency of around 1% is acceptable, because signal paths can be established with 1 ...
A coil with a core which forms a closed loop, possibly with some narrow air gaps, is called a closed-core coil. By providing a closed path for the magnetic field lines, this geometry minimizes the magnetic reluctance and produces the strongest magnetic field. It is often used in transformers.
Magnetic flux always forms a closed loop, as described by Maxwell's equations, but the path of the loop depends on the reluctance of the surrounding materials. It is concentrated around the path of least reluctance. Air and vacuum have high reluctance, while easily magnetized materials such as soft iron have low reluctance. The concentration of ...
Magnetic path length (MPL) is the effective length of a closed magnetic loop inside a magnetic core made of ferromagnetic material which may be also gapped. [ 1 ] [ 2 ] MPL is relevant in transformer and inductor design and more generally in all kinds of magnetic reactors, such as in magnetic amplifiers and electromagnets .
Within a coronal loop, the paths of the moving electrically charged particles which make up its plasma—electrons and ions—are sharply bent by the Lorentz force when moving transverse to the loop's magnetic field. As a result, they can only move freely parallel to the magnetic field lines, tending to spiral around these lines.