the public’s desire to know how it all began‚ how atomic bombs work‚ and how living things function. The considerable interest in computers and devices does shine light on some CMP topics and‚ now and then‚ discoveries such as high temperature superconductivity or Bose-Einstein condensation do get coverage‚ but anything involving Einstein is news. Marvin L. Cohen Marvin L. Cohen Perhaps a lack of media attention isn’t so important when considering that‚ over the past 50 years‚ 21 Physics
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TERM PAPER ON SUPERCONDUCTIVITY BY: VISHAL K YADAV (B.TECH 1ST yr) Superconductivity "The discovery of superconductors" The phenomenon of superconductivity‚ in which the electrical resistance of certain materials completely vanishes at low temperatures‚ is one of the most interesting and sophisticated in condensed matter physics. It was first discovered by the Dutch physicist Heike Kamerlingh Onnes‚ who was the first to liquefy helium (which boils at 4.2 Kelvin at standard pressure)
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Problem P2.2 Superconductivity was first observed by Kamerlingh Onnes in 1911. In 1933 Meissner and Ochsenfeld discovered that superconducting metals cannot be penetrated by magnetic fields. Magnetic fields are expelled from a normal metal when it is cooled to the superconducting state. The macroscopic theory of superconductivity was developed by London and London in 1935 followed by the microscopic theory of Bardeen‚ Cooper and Schrieffer in 1957. A simple model of superconductivity calls for an electron
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Electrical Conductance and Insulation OVERVIEW: Every thing in the world is differentiable on the basis of its electrical conductance. Some things are called insulators and these substances never conduct electricity. they include things such as cold air‚wood and plastic. Then there are things that conduct electricity and current flows through them‚ they are called conductors. examples of conductors are most metals like copper and steel. Other materials that are sometimes used as conductors are
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below a certain temperature. Once in motion‚ an electrical current will flow in a closed loop within a superconducting material. This is the closest to scientists of a perpetual motion machine. In 1911‚ Heike Kamerlingh Onnes first observed superconductivity. He used mercury and cooled to four degrees Kelvin. When the mercury reached that temperature‚ the resistance disappeared. That meant that the electrical current flowed freely through it. In 1933‚ the “Meissner effect” was discovered. It told
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Physics assignment Aim To determine which factors affect the resistance of a conductor‚ and the mathematical relationship that exists between these variables. Hypothesis Copper wires would be a better conductor than nichrome wires because it would yield less resistance when they have same cross-sectional area‚ length and temperature. Resistance would be increased when length wires increased. Resistance would be increased when cross-sectional area of wires decreased. Resistivity of wires is a factor
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Resistance in a Conductor: The electrical resistance of an electrical conductor is the opposition to the passage of an electric current through that conductor. Electrical resistance shares some conceptual parallels with the mechanical notion of friction. The SI unit of electrical resistance is the ohm (Ω).An object of uniform cross section has a resistance proportional to its resistivity and length and inversely proportional to its cross-sectional area. All materials show some resistance‚ except
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Prashant Zanwar University of Central Florida I. Introduction To Maglev Technology And Application 1.1 Principle of Maglev System Maglev is a system in which the vehicle runs levitated from the guideway (corresponding to the rail tracks of conventional railways) by using electromagnetic forces between superconducting magnets on board the vehicle and coils on the ground. The following is a general explanation of the principle of Maglev. fig. 1.1 1.1.1 Magnetic Levitation The "8" figured levitation
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no resistance that means there is no loss in energy. Superconductivity creates much more energy than a normal conductor. If a current can be superconducting its flow of electricity will remain continuous. There are 2 types of Superconductors: Type I and Type II. Type I Superconductors are made from pure metals. Type I has a zero electricity resistivity‚ zero magnetic field‚ and critical magnetic field above which superconductivity stops. (hyperphysics) Type I Superconductors are often
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Aim: To investigate the factors that affect the resistance in a conductor. The main factors that affect the resistance in a conductor are: · Length · Temperature · Cross sectional area · Material · Magnetism The factor that we are going to change is the cross sectional area. Hypothesis: I think that the higher the cross sectional area‚ the lower the resistance in the conductor will be. This is because the Resistance in a metal conductor happens because as the electrons move through the material
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