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AIPMT Syllabus
... Electric current, flow of electric charges in a metallic conductor, drift velocity and mobility, and their relation with electric current; Ohm’s law, electrical resistance, V-I characteristics (liner and nonlinear), electrical energy and power, electrical resistivity and conductivity. ...
... Electric current, flow of electric charges in a metallic conductor, drift velocity and mobility, and their relation with electric current; Ohm’s law, electrical resistance, V-I characteristics (liner and nonlinear), electrical energy and power, electrical resistivity and conductivity. ...
Lecture 10 - MyCourses
... – is sufficiently sensitive, i.e. (Dx/x)/(DT/T) is large enough using any probe that – is in good thermal contact with the body to be measured – reaches thermal equilibrium quickly – has small thermal capacity – does not produce intolerable heating – does not change characteristics over time It is d ...
... – is sufficiently sensitive, i.e. (Dx/x)/(DT/T) is large enough using any probe that – is in good thermal contact with the body to be measured – reaches thermal equilibrium quickly – has small thermal capacity – does not produce intolerable heating – does not change characteristics over time It is d ...
Trade-off between EMI Separator and D. Sakulhirirak , V. Tarateeraseth
... From Fig. 2 shown the relationship between sintering temperature and critical current (IC). It’s found that, the highest IC is 2.2 A at sintering temperature 930oC. At the highest IC sample must be applied external magnetic field (BEXT) higher than the low IC sample, to destroy the superconducting s ...
... From Fig. 2 shown the relationship between sintering temperature and critical current (IC). It’s found that, the highest IC is 2.2 A at sintering temperature 930oC. At the highest IC sample must be applied external magnetic field (BEXT) higher than the low IC sample, to destroy the superconducting s ...
Electric-field enhancement of beam coupling in Sn2P2S6
... polarization axis [5]). A dc external field is applied along the grating vector. It has been found previously [2] that all photorefractive SPS crystals available to us (more than a dozen samples tested) can be divided into two groups, Type I and Type II, thus distinguishing the samples by the beam-c ...
... polarization axis [5]). A dc external field is applied along the grating vector. It has been found previously [2] that all photorefractive SPS crystals available to us (more than a dozen samples tested) can be divided into two groups, Type I and Type II, thus distinguishing the samples by the beam-c ...
Superconductivity
![](https://commons.wikimedia.org/wiki/Special:FilePath/Meissner_effect_p1390048.jpg?width=300)
Superconductivity is a phenomenon of exactly zero electrical resistance and expulsion of magnetic fields occurring in certain materials when cooled below a characteristic critical temperature. It was discovered by Dutch physicist Heike Kamerlingh Onnes on April 8, 1911 in Leiden. Like ferromagnetism and atomic spectral lines, superconductivity is a quantum mechanical phenomenon. It is characterized by the Meissner effect, the complete ejection of magnetic field lines from the interior of the superconductor as it transitions into the superconducting state. The occurrence of the Meissner effect indicates that superconductivity cannot be understood simply as the idealization of perfect conductivity in classical physics.The electrical resistivity of a metallic conductor decreases gradually as temperature is lowered. In ordinary conductors, such as copper or silver, this decrease is limited by impurities and other defects. Even near absolute zero, a real sample of a normal conductor shows some resistance. In a superconductor, the resistance drops abruptly to zero when the material is cooled below its critical temperature. An electric current flowing through a loop of superconducting wire can persist indefinitely with no power source.In 1986, it was discovered that some cuprate-perovskite ceramic materials have a critical temperature above 90 K (−183 °C). Such a high transition temperature is theoretically impossible for a conventional superconductor, leading the materials to be termed high-temperature superconductors. Liquid nitrogen boils at 77 K, and superconduction at higher temperatures than this facilitates many experiments and applications that are less practical at lower temperatures.