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Physics  January 17, 2001 E
Physics January 17, 2001 E

... PH 317 Why does light go slower in glass? (From Orear’s Physics) ...
Electromagnetic interaction of a conducting cylinder with a magnetic
Electromagnetic interaction of a conducting cylinder with a magnetic

... In case of large h the dependencies on the distance change because of the finite width of the cylinder. In Figure 3 the force decays as h−6 and the torque as h−5 . In analogy with the translating conducting square bar studied in [3], we have formulated and solved an analytical approximation for this ...
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... focusing anode ensures that electrons leaving the cathode in slightly different directions are focused down to form a narrow beam so that electrons are converged to a definite point on screen. ...
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PDP-11 Formation of Closed Flux Surfaces in Reconnection Current

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Direct observation of the current distribution in thin superconducting

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WATKINS - Chabot College

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3.2.2. Natural (Mode) Resonance Signatures

... Electromagnetic Magnetic Singularity Identification (EMSI) used for high frequencies (such as GPR), the MSI is less influenced by the soil properties due to low frequencies [Geng et al, 1999]. Geng et al extended concept of the natural resonance frequencies to highly conducting and permeable BOR sha ...
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Continuity Equation and Kirchhoff`s Current Law

... N h and  h are respectively the density and mobility of holes. The point form Ohm’s law can be used to derive form of Ohm’s law used in circuit theory relating the current through a conductor to the voltage across the conductor. Let us consider a homogeneous conductor of conductivity  , length L a ...
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...  For a given system, once the error field amplitude is larger than a critical value ψc, the magnetic island will eventually be locked as shown in Figures 1 and 2. The stronger the error field is, the less time is required for the magnetic island to be locked. Figure 3 shows the relation between the ...
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... When the droplets are charged an equal negative charge will remain behind on the spray gun. We can assume that this is transferred from the spray head to earth through a conducting wire. (ii) The droplets are accelerated to the object to be coated by an electric field between the spray head and the ...
CBSE 2008 Physics Solved Paper XII
CBSE 2008 Physics Solved Paper XII

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Electromagnet



An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. Electromagnets usually consist of a large number of closely spaced turns of wire that create the magnetic field. The wire turns are often wound around a magnetic core made from a ferromagnetic or ferrimagnetic material such as iron; the magnetic core concentrates the magnetic flux and makes a more powerful magnet.The main advantage of an electromagnet over a permanent magnet is that the magnetic field can be quickly changed by controlling the amount of electric current in the winding. However, unlike a permanent magnet that needs no power, an electromagnet requires a continuous supply of current to maintain the magnetic field.Electromagnets are widely used as components of other electrical devices, such as motors, generators, relays, loudspeakers, hard disks, MRI machines, scientific instruments, and magnetic separation equipment. Electromagnets are also employed in industry for picking up and moving heavy iron objects such as scrap iron and steel.
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