Zero magnetic inductance

Names and symbols used for galvanomagnetic and thermomagnetic effects in crystals are summarized in Table 15.8. In the presence of a magnetic field, crystal properties become functions of the magnetic induction B, and the ORRs, hitherto applied in the zero-field form Lik = Lki are... 

One interesting application of the theory developed in the preceding sections involves the superconducting state. A transition from the normal to the superconducting state occurs in some materials at a fixed temperature Tc. Such a state is characterized not only by the complete disappearance of electrical resistivity, but also by the fact that, in type I, soft superconductors at least, the magnetic induction B is zero. Since B - H + 4irM, this means that for such superconductors M - - 4jtH. 

COercivity. The magnetic intensity required to reduce the magnetic induction in a substance from saturation to zero. 

As a consequence of zero-resistance, the electric field everywhere within a superconductor is zero [16], In 1933, Meissner and Ochsenfeld showed that the magnetic induction within a superconductor is also zero-valued [17], As a consequence of this phenomenon, termed the Meissner effect", all magnetic flux is expelled from the interior of a perfect superconductor, and the material acts as a perfect diamagnet (Fig. 

The energy of the closed-shell molecule perturbed by the external magnetic field and the magnetic field of the nuclei can be expanded in the magnetic induction B and in the nuclear moments Mjf around zero field and zero magnetic moments. 

Free magnetic poles, the magnetic analog of electric charges, have never been observed. This implies that the divergence of the magnetic induction B equals zero, which serves as the second Maxwell s equation ... 

In farther text we consider a one-dimensional model with galvanic (i.e., purely electrical) Auger process suppression. Here, we actually continue the consideration presented in this chapter. Since the term of magnetic induction is here equal to zero, carrier transport is described by (3.57) and (3.58). Thus, the generalized model of a nonequilibrium detector is reduced to the van Roosbroeck s model [353]. This well-known model is the basis of programs for simulation of practically all standard semiconductor devices. 

The phenomenon of perfect diamagnetism is not implied by perfect conductivity (i.e., (7 = oo) alone, even though perfect conductivity does imply a somewhat related property If a perfect conductor, initially in zero magnetic field, is moved into a region of nonzero field (or if a field is turned on), then Faraday s law of induction gives rise to eddy currents that cancel the magnetic field in the interior. It turns out that a perfect conductor when placed in a magnetic field cannot produce a permanent eddy current screen the field will penetrate about 1 cm in an hour. 

Since there are no magnetic charges (monopoles) in nature, the flux of the magnetic induction through the closed surface is zero AO). 

The magnetic field rotates at a synchronous speed, so it should also rotate the rotor. But this is not so in an induction motor. During start-up, the rate of cutting of llux is the maximum and so is the induced e.m.f. in the rotor circuit. It diminishes with motor speed due to the reduced relative speed between the rotor and the stator flux. At a synchronous speed, there is no linkage of flux and thus no induced e.m.f. in the rotor circuit, consequently the torque developed is zero. 

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