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The magnetic field lines are indicated, with their direction shown by arrows. The magnetic flux corresponds to the 'density of field lines'. The magnetic flux is thus densest in the middle of the solenoid, and weakest outside of it. Faraday's law of induction makes use of the magnetic flux Φ B through a region of space enclosed by a wire loop.
The generator can also experience losses from the Hall effect current, which makes the Faraday duct inefficient. [citation needed] Most further refinements of MHD generators have tried to solve this problem. The optimal magnetic field on duct-shaped MHD generators is a sort of saddle shape.
But when the small coil is moved in or out of the large coil (B), the magnetic flux through the large coil changes, inducing a current which is detected by the galvanometer (G). [ 1 ] Faraday's law of induction (or simply Faraday's law ) is a law of electromagnetism predicting how a magnetic field will interact with an electric circuit to ...
Sensor or pickup coils - these are used to detect external time-varying magnetic fields; Inductive sensor - a coil which senses when a magnet or iron object passes near it; Recording head - a coil which is used to create a magnetic field to write data to a magnetic storage medium, such as magnetic tape, or a hard disk. Conversely it is also ...
The brake disk, with its attached rare-earth magnets, rotates to form the armature. A plywood disk carrying multiple axial coils is placed alongside this, with an iron armature ring behind it. In large sizes, from the 100 kW to MW range, the machines developed for modern wind turbines are termed permanent magnet synchronous generators. [14]
For a general problem the relationship is non-linear (see also magnetic hysteresis). If there is a finite change in flux linkage from one value to another (e.g. from λ 1 {\displaystyle \lambda _{1}} to λ 2 {\displaystyle \lambda _{2}} ), it can be calculated as: Δ W stored = ∫ λ 1 λ 2 i ( λ ) d λ {\displaystyle \Delta W_{\text{stored ...
The magnetic field of all the turns of wire passes through the center of the coil, creating a strong magnetic field there. [2] A coil forming the shape of a straight tube (a helix) is called a solenoid. [1] [2] The direction of the magnetic field through a coil of wire can be determined by the right-hand rule.
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.