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The rotating magnetic field is the key principle in the operation of induction machines.The induction motor consists of a stator and rotor.In the stator a group of fixed windings are so arranged that a two phase current, for example, produces a magnetic field which rotates at an angular velocity determined by the frequency of the alternating current.
The magnetic field of larger magnets can be obtained by modeling them as a collection of a large number of small magnets called dipoles each having their own m. The magnetic field produced by the magnet then is the net magnetic field of these dipoles; any net force on the magnet is a result of adding up the forces on the individual dipoles.
English: Gradients in magnetic field strength result in a magnetic pressure force perpendicular to the field in the direction of decreasing magnetic field strength. Here, the strength of the magnetic field is depicted by the density of the vertical field lines and the black/white gradient, and the magnetic pressure force / is depicted by a horizontal arrow.
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More precisely, the term magnetic moment normally refers to a system's magnetic dipole moment, which produces the first term in the multipole expansion [note 1] of a general magnetic field. Both the torque and force exerted on a magnet by an external magnetic field are proportional to that magnet's magnetic moment.
The electromagnets are able to create a variable magnetic field across the fluid passages. When the magnets are off, the fluid travels through the passages freely. When the magnets are turned on, the iron particles in the fluid create a fibrous structure through the passages in the same direction as the magnetic field.
English: Magnetic tension is a restoring force with units of force density that acts to straighten bent magnetic field lines. The force, depicted by a red arrow, is directed towards the center of curvature in blue and has magnitude κ B 2 {\displaystyle \kappa B^{2}} where κ {\displaystyle \kappa } is the curvature and B {\displaystyle B} is ...
A ferromagnetic cylinder showing various magnetization patterns and magnetic field Cylinder magnetization. A Halbach cylinder is a magnetized cylinder composed of ferromagnetic material producing (in the idealized case) an intense magnetic field confined entirely within the cylinder, with zero field outside. The cylinders can also be magnetized ...