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Superconductors are:...

Superconductors are:

A

most exotic diamagnetic materials

B

ferromagnetic material with low resistivity

C

Paramagnetic materials at high temperature

D

none of these

Text Solution

Verified by Experts

The correct Answer is:
A
Superconductors 8II€ most exotic diamagnetic materials these are materials cooled to very low temper s, which exhibits both perfect conductivity and perfect diamagnetism.
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Electrical resistance of certain materials, known as superconductors, changes abruptly from a nonzero value of zero as their temperature is lowered below a critical temperature T_(C) (0) . An interesting property of super conductors is that their critical temperature becomes smaller than T_(C) (0) if they are placed in a magnetic field, i.e., the critical temperature T_(C) (B) is a function of the magnetic field strength B. The dependence of T_(C) (B) on B is shown in the figure. . A superconductor has T_(C) (0) = 100 K . When a magnetic field of 7.5 Tesla is applied , its T_(C) decreases to 75 K. For this material one can difinitely say that when

Electrical resistance of certain materials, known as superconductors, changes abruptly from a nonzero value of zero as their temperature is lowered below a critical temperature T_(C) (0) . An interesting property of super conductors is that their critical temperature becomes smaller than T_(C) (0) if they are placed in a magnetic field, i.e., the critical temperature T_(C) (B) is a function of the magnetic field strength B. The dependence of T_(C) (B) on B is shown in the figure. . In the graphs below, the resistance R of a superconductor is shown as a function of its temperature T for two different magnetic fields B_1 (solid line) and B_2 (dashed line). If B_2 is larget than B_1 which of the following graphs shows the correct variation of R with T in these fields?

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NCERT FINGERTIPS-MAGNETISM AND MATTER -Magnetic Properties Of Materials
  1. Point out the correct set of diamagnetic substances

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  2. Which of the following is universal magnetic property

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  3. Superconductors are:

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  4. Magnetic susceptibility of a diamagnetic substances

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  5. If a magnetic material is having magnetic susceptibility (chi)=-1 then...

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  6. A ball of superconducting material is dipped in liquid nitrogen and p...

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  7. The range of magnetic susceptibility and relative magnetic permeabilit...

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  8. Out of given paramagnetic substance (Calcium, Chromium, Oxygen and Tun...

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  9. Point out the best representation of relation between magnetic suscep...

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  10. The correct M-H curve for a paramagnetic material at a constant tempe...

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  11. The magnetic susceptibility of a paramagnetic material at -73^(@)C "is...

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  12. The magnetic susceptibility of a paramagnetic substance at - 173 .^(...

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  13. A paramagnetic liquid is taken in a U-tube and arranged so that one o...

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  14. Mark the correct set of ferromagnetic substances

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  15. In an experiment it is found that the magnetic susceptibility of given...

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  16. Magnetic permeability is maximum for

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  17. Which of following property shows the property of ferromagnetic subst...

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  18. Nickel shows ferromagnetic property at room temperature. If the temper...

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  19. The temperature of transition from ferromagnet property to paramagnet...

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  20. A domain in ferromagnetic iron is in the form of a ube of side length...

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