- ACritical temperature.
- BAbsolute temperature.
- CTripple point.
- DNone of the above.
Explanation:
Critical temperature is the temperature below which metals when taken exhibit zero resistivity and turns into a superconductor. The critical temperature varies with the individual material. Because these materials have no electrical resistance, meaning electrons can travel freely through them, they can carry large amounts of electrical current for long periods of time without losing energy as heat. The transition is so sudden and complete that it appears to be a transition to a different phase of matter; known as the superconducting phase.

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An electron having charge ‘e’ and mass ‘m’ is moving in a uniform electric field E. Its acceleration will be
|
(a) |
(b) |
(c) |
(d) |
At room temperature, a P-type semiconductor has
|
(a) Large number of holes and few electrons |
|
(b) Large number of free electrons and few holes |
|
(c) Equal number of free electrons and holes |
|
(d) No electrons or holes |
The rays of different colours fail to converge at a point after going through a converging lens. This defect is called:
A bar magnet of length 3 cm has points A and B along its axis at distances of 24 cm and 48 cm on the opposite sides. Ratio of magnetic fields at these points will be
|
(a) 8 |
(b) 1/2 |
(c) 3 |
(d) 4 |