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In classical electromagnetism, Ampère's circuital law (not to be confused with Ampère's force law) [1] relates the circulation of a magnetic field around a closed loop to the electric current passing through the loop. James Clerk Maxwell derived it using hydrodynamics in his 1861 published paper "On Physical Lines of Force". [2]
A quad antenna is a self-resonant loop in a square shape; this one also includes a parasitic element.. Loop antennas may be in the shape of a circle, a square, or any other closed geometric shape that allows the total perimeter to be slightly more than one wavelength.
the upper half of a vertical full-wavelength loop antenna mounted on the ground (not to be confused with the visually similar but electrically different half-square antenna described below, under array antennas, [r] nor to be confused with the halo antenna, described next). The full loop is cut at two opposite points along its perimeter, and ...
Loop antenna - a coil which serves as a radio antenna, to convert radio waves to electric currents. Rogowski coil - a toroidal coil used as an AC measuring device; Musical instrument pickup - a coil used to produce the output audio signal in an electric guitar or electric bass. Flux gate - a sensor coil used in a magnetometer
For example, since the magnetic field is divergence-free (Gauss's law for magnetism; i.e., =), always exists that satisfies the above definition. The vector potential A {\displaystyle \mathbf {A} } is used when studying the Lagrangian in classical mechanics and in quantum mechanics (see Schrödinger equation for charged particles , Dirac ...
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A 7.0 magnitude earthquake was reported off the coast of Northern California on Thursday, according to the United States Geological Survey. The epicenter of the "strong" quake was off the coast ...
In magnetostatics, the force of attraction or repulsion between two current-carrying wires (see first figure below) is often called Ampère's force law. The physical origin of this force is that each wire generates a magnetic field , following the Biot–Savart law , and the other wire experiences a magnetic force as a consequence, following ...
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