11.4

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Задание:

11.4 Test your knowledge

When we say a metal ... electricity well, we really mean it offers little or no ... when you try to make a current flow through it; when we say plastics insulate well, we're actually saying that they put high ... to electric currents. Resistance is often a much more useful concept than trying to divide materials into ... and "insulators". In 1911 a Dutch physicist named H.K. Onnes found that ... resistance suddenly disappeared when he cooled a wire made of mercury to the temperature of -269C (or4 K). In other words, he'd discovered ... . He also found out that if applied a strong ... field to his mercury, the ... vanished as quickly as it had arrived.

What is the reason of total losses in modern transformers? Why information can be retrieved quickly due to superconductivity? What metal can become a superconductor at -273 C? How long can superconductors possess their qualities withiout special conditions? How can we get an ideal transformer? Practical application of superconductors is ....

Landau and Ginzburg introduced a model which was useful in understanding electromagnetic ____________________ of superconductors. A superconductor with a transition temperature could be _____ with liquid nitrogen. In 1911 superconductivity was ______________________________ by a Dutch physicist K.Onnes. Prestige, economic and military ________________________ could come well to the nation that first will master such a new field of physics as superconductivity. They found a metallic ceramic __________ to become a superconductor. The latest achievements in the______of superconductivity have made a revolution in industry.

They believed him to be capable. Japanese designers believe a new ceramic engine to replace the conventional one. The possibilities of guided missiles as an effective weapon are seemingly unlimited. The rains made the road impassable. It would seem desirable to make a study of this phenomenon.

Решение: