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PHYSICS (Theory)
... 2. An electron beam projected along + X-axis, experiences a force due to a magnetic field along the + Y-axis. What is the direction of the magnetic field ? 1 3. The power factor of an a.c. circuit is 0.5. What will be the phase difference between voltage and current in this circuit ? 1 4. Electrons ...
... 2. An electron beam projected along + X-axis, experiences a force due to a magnetic field along the + Y-axis. What is the direction of the magnetic field ? 1 3. The power factor of an a.c. circuit is 0.5. What will be the phase difference between voltage and current in this circuit ? 1 4. Electrons ...
5.1.3 Electromagnetism B
... It consists of two coils linked by a laminated soft iron core. The primary coil is connected to a signal generator and the secondary coil to a voltage sensor, interface and computer. The number of turns on the secondary coil is double that on the primary coil. (i) Draw on Fig 9.the complete paths of ...
... It consists of two coils linked by a laminated soft iron core. The primary coil is connected to a signal generator and the secondary coil to a voltage sensor, interface and computer. The number of turns on the secondary coil is double that on the primary coil. (i) Draw on Fig 9.the complete paths of ...
Measurement and Exposure Assessment for Standard Compliance
... antenna contains the radiation source, as well as any source of multipath scattering and if there is enough distance (several largest dimensions of the radiating portion of the source) between the receiving antenna and the radiation and any scattering sources. The reactive near field region is chara ...
... antenna contains the radiation source, as well as any source of multipath scattering and if there is enough distance (several largest dimensions of the radiating portion of the source) between the receiving antenna and the radiation and any scattering sources. The reactive near field region is chara ...
A model for fast extragalactic radio bursts
... that the magnetic field is B = 2−1/2 Bpulse . In the downstream plasma, the inverse population is formed at the particle energies less than me c2 Γcd . In this case, the maser emission predominantly occurs at the rotation frequency of these particles1 , ν ′ = Ω′B /2π = eB ′ /(2πme cΓcd ), where the ...
... that the magnetic field is B = 2−1/2 Bpulse . In the downstream plasma, the inverse population is formed at the particle energies less than me c2 Γcd . In this case, the maser emission predominantly occurs at the rotation frequency of these particles1 , ν ′ = Ω′B /2π = eB ′ /(2πme cΓcd ), where the ...
ICEFA - authors
... studied with several ESA test cases. One concerns the ICP torch at atmospheric pressure. The plasma can be considered at thermal and chemical local equilibrium. Some experimental problems (extinction of the plasma) appear with the titan atmosphere (CH4-N2) unlike the Mars atmosphere (CO2-N2). We obs ...
... studied with several ESA test cases. One concerns the ICP torch at atmospheric pressure. The plasma can be considered at thermal and chemical local equilibrium. Some experimental problems (extinction of the plasma) appear with the titan atmosphere (CH4-N2) unlike the Mars atmosphere (CO2-N2). We obs ...
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.