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1从中学物理视角看超导实验现象2013年天津高考理综题:超导现象是20世纪人类重大发现之一,日前我国己研制出世界传输电流最大的高温超导电缆并成功示范运行.(1)超导体在温度特别低时电阻可以降到几乎为0,这种性质可以通过实验研究.将一个闭合超导金属圈环水平放置在匀强磁场中,磁感线垂直于圈环平面向上,逐渐降低温度使环发生由正常态到超导态的转变后突然撤去磁场,若此后环中的电流不随时间变化,则表
1 Superconductivity Experimental Phenomenon from the View of Physics in High School Tianjin University Entrance Examination in 2013: Superconductivity is one of the major discoveries of mankind in the 20th century. Recently, China has developed a high-temperature superconducting cable with the largest transmission current in the world and successfully demonstrated its operation. 1) The resistance of the superconductors can be reduced to almost zero at very low temperatures, a property that can be experimentally studied by placing a closed superconducting metal hoop horizontally in a uniform magnetic field perpendicular to the plane of the hoop, Gradually reduce the temperature so that the ring from the normal state to the superconducting state after the sudden removal of the magnetic field changes, if the current in the ring does not change over time, the table