Home
Class 12
PHYSICS
Write the mathematical relation for the ...

Write the mathematical relation for the resistivity of a material in terms of relaxation time, number density, mass and charge carries in it. Explain using this relation, why the resistivity of a metal increases and that of semiconductor decreases with rise in temperature.

Promotional Banner

Topper's Solved these Questions

  • ELECTRIC CURRENT. RESISTANCE AND E.M.F

    MODERN PUBLICATION|Exercise EXERCISE|64 Videos

  • DISPERSION

    MODERN PUBLICATION|Exercise EXERCISE|54 Videos

  • ELECTRIC FIELD

    MODERN PUBLICATION|Exercise EXERCISE|95 Videos

Similar Questions

Explore conceptually related problems

What do you understand by electrical resistivity and give its relation in mass, charge, number density and relaxation time.

Express electrical conductivity in terms of charge, mass, number density and relaxation time.

The electrical conductivity of metal decreases with rise in temperature, while that of a semiconductor increases. Explain

Explain how does resistivity of a conductor depend upon number density n of free electron relaxation time tau ?

Define the term resistivity and write its S.I. unit. Derive the expression for the resistivity in terms of number density of free electrons and relaxation time.

Why Manganin is used to make standard resistance coil ? How does the electric resistance of metal varies with the rise in its temperature ?

Using the concept of free electrons in a conductor, derive the expression for the conductivity of a wire in terms of number density and relaxation time. Hence obtain the relation between current density and the applied electric field E.

Define 'relaxation time' in a conductor. Explain how it varies with increase in temperature of a conductor. State the relation between resistivity and relaxation time.

Define relaxation time of the electrons drifting in a conductor. How is it related to the drift velocity of free electrons? Use this relation to deduce the expression for electrical resistivity of the material.

MODERN PUBLICATION-ELECTRIC CURRENT. RESISTANCE AND E.M.F-EXERCISE
  1. Define resistivity of a conductor. Explain the variation of resistance...

    Text Solution

    |

  2. Define resistivity and state its SI unit. State and explain how to res...

    Text Solution

    |

  3. Write the mathematical relation for the resistivity of a material in t...

    Text Solution

    |

  4. Explain with the help of a graph, the variation of conductivity with t...

    Text Solution

    |

  5. Explain the variation of conductivity of a metallic conductor with tem...

    Text Solution

    |

  6. Express electrical conductivity in terms of charge, mass, number densi...

    Text Solution

    |

  7. Define electric power and electric energy. Give their units.

    Text Solution

    |

  8. Prove that electric energy (W) consumed in a conductor is given by the...

    Text Solution

    |

  9. Obtain the formula for the power loss in a conductor of resistance R a...

    Text Solution

    |

  10. Explain colour code for carbon resistors giving examples.

    Text Solution

    |

  11. What is the need of combining different resistors? What is the resulta...

    Text Solution

    |

  12. Derive expression for the total resistance of a circuit in which a few...

    Text Solution

    |

  13. What do you mean by internal resiatnce, e.m.f. (electromotive force) a...

    Text Solution

    |

  14. What is internal resistance of a cell? Derive an expression for it.

    Text Solution

    |

  15. What do you mean by internal resiatnce, e.m.f. (electromotive force) a...

    Text Solution

    |

  16. What is internal resistance of a cell? Derive an expression for it.

    Text Solution

    |

  17. What is internal resistance of a cell? Derive an expression for it.

    Text Solution

    |

  18. What is the difference between e.m.f. and potential diffrence?

    Text Solution

    |

  19. When a battery of e.m.f E and internal resistance r is connected to a ...

    Text Solution

    |

  20. Derive the expression for internal resistance of a cell.

    Text Solution

    |