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The general field of how semiconductor properties are modified in the presence of a magnetic field is a very wide one. To do justice to the field, one would need to devote several chapters to this area as we have done for electric field effects. However, it can be argued that from a technology point of view the response of electrons in ...
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The field-line description has some useful properties: Magnetic field lines never cross. Magnetic field lines naturally bunch together in regions where the magnetic field is the …
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A magnetic field is defined as: A region in which a magnetic pole experiences a force. Magnetic field around a bar magnet. The magnetic field is strongest at the poles. Therefore, the magnetic field lines are closer together at the ends of the magnets; The magnetic field becomes weaker as the distance from the magnet increases. Therefore, …
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The presence of a magnetic field merely increases or decreases this potential difference once the particle has moved, and it is this change in the potential difference that we wish to determine. We can make the relationship between potential difference and the magnetic field explicit by substituting the right side of Equation ref{m0059_eFm ...
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Magnetic Properties. (see also textbook chapter 16) The properties to be considered are "weak" magnetic materials (paramagnets, diamagnets); "strong" magnetic materials …
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That's why we call the loop a magnetic dipole. The word "dipole" is slightly misleading when applied to a magnetic field because there are no magnetic "poles" that correspond to electric charges. The magnetic "dipole field" is not produced by two "charges," but by an elementary current loop.
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The circular loop of Figure (PageIndex{1}) has a radius R, carries a current I, and lies in the xz-plane.What is the magnetic field due to the current at an arbitrary point P along the axis of the loop?. Figure (PageIndex{1}): Determining the magnetic field at point P along the axis of a current-carrying loop of wire.. We can use the Biot-Savart law to find the …
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The magnetic field of a wire was first discovered during an experiment by Hans Christian Oersted (1777-1851) of Denmark in 1820. This experiment consisted of running a current through a wire and placing a compass underneath it to see if there was any effect. The effect he found changed the world forever: he had discovered the …
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If the magnetic field is constant than the magnetic flux passing through a surface (S) is where B – the magnitude of the magnetic field S – area of surface θ – angle between the magnetic field lines and perpendicular distance normal to the surface area Magnetic flux for a closed surface Magnetic flux for open surface Where
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where A(r i) is the magnetic vector potential experienced by electron i, and q i is the charge of the particle, which for an electron is − e.The corresponding magnetic field induction is B (see below).ϕ represents the external scalar electrostatic potential, and the electric field due to this external potential is ( mathbf{F}=-nabla phi ).We have also …
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The magnetic field both inside and outside the coaxial cable is determined by Ampère's law. Based on this magnetic field, we can use Equation ref{14.22} to calculate the energy density of the magnetic field. The magnetic energy is calculated by an integral of the magnetic energy density times the differential volume over the cylindrical shell.
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Properties such as coercivity (H c) and magnetic anisotropy (which in the case of a uniaxial material can be characterized by, e.g. the uniaxial anisotropy field, H k) are affected by mechanical strain and crystal symmetry, which are clearly altered at a surface or an interface. When averaged over the entire volume of the film, these …
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rewriting this gives the magnetic moment as [μ= 2.828 sqrt{chi_mT} B.M.] There are two main types of magnetic compounds, those that are diamagnetic (compounds that are repelled by a magnetic field) and …
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A magnetic field always induces a magnetic dipole in an atom. This induced dipole points opposite to the applied field, so its magnetic field is also directed opposite to the applied field. In paramagnetic and ferromagnetic materials, the induced magnetic dipole is masked by much stronger permanent magnetic dipoles of the atoms. ...
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A magnetic dipole produces a magnetic field, and, as we will see in the next section, moving magnetic dipoles produce an electric field. Thus, electricity and magnetism are …
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Paramagnets act like magnets while in the presence of an externally applied magnetic field. Diamagnets create a magnetic field in opposition to an externally applied magnetic field. Thus, they repulse magnets. Diamagnetism is a property of all materials and always makes a weak contribution to the material's response to a magnetic field.
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The cathode is built into the center of an evacuated, lobed, circular chamber. A magnetic field parallel to the filament is imposed by a permanent magnet. The magnetic field causes the electrons, attracted to the (relatively) positive outer part of the chamber, to spiral outward in a circular path, a consequence of the Lorentz force.
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Because the magnetic field lines must form closed loops, the field lines close the loop outside the solenoid. The magnetic field lines are much denser inside the solenoid than outside the solenoid. The resulting magnetic field looks very much like that of a bar magnet, as shown in Figure 20.15. The magnetic field strength deep inside a solenoid is
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Answer: d Explanation: The magnetic flux density is the product the permeability and the magnetic field intensity. This statement is always true for any material (permeability).
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The magnetic field lines are the smooth curves the tangent to which at any point gives the direction magnetic field at that point. They are pictorial representations of a magnetic field. Some properties of magnetic field lines are: They exist in closed loops. Outside the magnet, they are directed from the north pole to the south pole.
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the magnitude of the magnetic field B. In Fig. 5.2(a), B is larger around region ii than in region i . (iv) The magnetic field lines do not intersect, for if they did, the direction of the magnetic field would not be unique at the point of intersection. One can plot the magnetic field lines in a variety of ways. One way is to place a
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To explore the effect of a stable magnetic field on precipitation kinetics in Al–Zn–Mg–Cu alloys (AA7075) with ultrafine-grained (UFG) structure, the precipitation kinetics of UFG Al alloys after ageing at 110–170 °C for 10 min without and with magnetic field of 1T were investigated in detail by small angle X-ray scattering (SAXS), …
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Magnetic fields can be pictorially represented by magnetic field lines, the properties of which are as follows: The field is tangent to the magnetic field line. Field strength is proportional to the line density. Field lines cannot cross. Field lines are continuous loops. 22.4: Magnetic Field Strength- Force on a Moving Charge in a …
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A fundamental property of a static magnetic field is that, unlike an electrostatic field, it is not conservative. A conservative field is one that does the same amount of work on a particle moving between two different points regardless of the path chosen. Magnetic fields do not have such a property.
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A magnetic field exerts a torque which orients dipoles with the field. Externally applied magnetic field is called the magnetic field strength, H (amperes/meter) Magnetic field …
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Diamagnetism: Diamagnetic material shows its magnetic properties only when placed in an external magnetic field B ext. In an external magnetic field, the material produces magnetic dipoles in the opposite direction to that of the external magnetic field. ... Torque τ on the iron bar if it is placed in the magnetic field of 0.80 T …
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Learn how a magnetic field exerts a force on a current-carrying conductor and how to calculate the magnitude and direction of this force. Explore the applications of this phenomenon in motors, generators, and other devices. Compare and contrast the effects of magnetic fields on conductors and insulators.
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(54) and (55), or in all regions where the magnetic field exists, as apparent from Eq. (57b), cannot be done within the framework of magnetostatics, and only the electrodynamics gives a decisive preference for the latter choice. For the practically important case of currents flowing in several thin wires, Eq. (54) may be first integrated over ...
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Permeability ((mu), H/m) quantifies the effect of matter in determining the magnetic field in response to current. Permeability is addressed in Section 2.6. Conductivity ((sigma), S/m) quantifies the effect of matter in determining the flow of current in response to an electric field. Conductivity is addressed in Section 6.3.
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Ferromagnets. Only certain materials (e.g., iron, cobalt, nickel, and gadolinium) exhibit strong magnetic effects. These materials are called ferromagnetic, after the Latin word ferrum (iron). A group of materials made from the alloys of the rare earth elements are also used as strong and permanent magnets (neodymium is a common one).
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