Home
Class 12
PHYSICS
If n, e, tau, m, are representing electr...

If n, e, `tau`, m, are representing electron density charge, relaxation time and mass of an electron respectively then the resistance of wire of length 1 and cross sectional area A is given by

A

`(ml)/("ne"^(2) tau A)`

B

`(2m tau A)/("ne"^(2) l)`

C

`("ne"^(2) tau A)/(2m) " "l/B`

D

`("ne"^(2)m)/(2tau) l/A`

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • CURRENT AND RESISTANCE

    RESNICK AND HALLIDAY|Exercise Practice Questions (Linked Comprehension)|5 Videos

  • CURRENT AND RESISTANCE

    RESNICK AND HALLIDAY|Exercise Practice Questions (Matrix-Match)|9 Videos

  • CURRENT AND RESISTANCE

    RESNICK AND HALLIDAY|Exercise Problems|36 Videos

  • CIRCULAR MOTION

    RESNICK AND HALLIDAY|Exercise CHECK POINTS|6 Videos

  • ELASTICITY

    RESNICK AND HALLIDAY|Exercise PRACTICE QUESTIONS (Integer Type)|3 Videos

Similar Questions

Explore conceptually related problems

The resistance will be least in a wire with length, cross-section area respectively,

If the free electron density be n and relaxation time be tau , the electrical conductivity of a conductor may be expressed as

If n ,e,m and tau are free electron density in conductor , charge of electron, mass of electron and relaxation time of free electrons , then resistivity rho of the conductor can be expressed as

The speed of transverse waves in a wire of length L , density rho , cross - sectional area A and stretched with a tension T is given by

If two conducting wires Aand B of same dimensions have electron density ratio 1: 3 . If their relaxation time is same then the ratio of resistance of A to resistance of B is

If in a conductor number density of electrons is 8.5xx10^(28) average relaxation time 25 femtosecond mass of electron being 9.1xx10^(-31) kg, the resistivity would be of the order.

RESNICK AND HALLIDAY-CURRENT AND RESISTANCE-Practice Questions (Single Corret Choice Type)
  1. Assume that each atom of copper contributes one free electron. Density...

    Text Solution

    |

  2. In an electrical cable there is a single wire of radius 9 mm of copper...

    Text Solution

    |

  3. If n, e, tau, m, are representing electron density charge, relaxation ...

    Text Solution

    |

  4. In which one of the following situations does a conventional electric ...

    Text Solution

    |

  5. A conducting ring of radius R has charge Q distributed unevenly over i...

    Text Solution

    |

  6. A long conductor having charge q, with charge density lambda is moving...

    Text Solution

    |

  7. In an ionic solution, sodium ions (Na^(+)) are moving to the right and...

    Text Solution

    |

  8. When you flip a switch to turn on a light, the delay before the light ...

    Text Solution

    |

  9. The following ligure shows the cross section of a wire. Which of the f...

    Text Solution

    |

  10. A hollow copper tube of 5 m length has got external diameter equal to ...

    Text Solution

    |

  11. A copper wire is fabricated that has a gradually increasing diameter a...

    Text Solution

    |

  12. The magnitude of the electric field within a conducting wire depends o...

    Text Solution

    |

  13. Which one of the following statements concerning the electric field in...

    Text Solution

    |

  14. Wires A and B are identical except that each is made from a different ...

    Text Solution

    |

  15. A conductor of area of cross-section. A having charge carries, each ha...

    Text Solution

    |

  16. How does the resistivity of a metal wire change if either the number o...

    Text Solution

    |

  17. The given figure represents a portion of a wire in a circuit. A curren...

    Text Solution

    |

  18. Lengths and cross-sectional areas of four pieces of nichrome wire are ...

    Text Solution

    |

  19. The insulated wiring in a house can safely carry a maximum current of ...

    Text Solution

    |

  20. If the current in an electric bulb decreases by 0.5 %, the power in th...

    Text Solution

    |