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 l and cross sectional area A is given by

A

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

B

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

C

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

D

`(n e^(2) tau A)/(2 ml)`

Text Solution

Verified by Experts

Promotional Banner

Topper's Solved these Questions

  • QUESTION PAPER 2022 TERM 1 SET 1

    XII BOARDS PREVIOUS YEAR|Exercise SECTION-C|6 Videos

  • QUESTION PAPER 2022 TERM 1 SET 1

    XII BOARDS PREVIOUS YEAR|Exercise SECTION-C|6 Videos

  • QUESTION PAPER 2022 SET - 5

    XII BOARDS PREVIOUS YEAR|Exercise SECTION-C (CASE STUDY)|5 Videos

  • QUESTION PAPER 2022 TERM 1 SET 2

    XII BOARDS PREVIOUS YEAR|Exercise SECTION C|6 Videos

Similar Questions

Explore conceptually related problems

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

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

XII BOARDS PREVIOUS YEAR-QUESTION PAPER 2022 TERM 1 SET 1-SECTION-B
  1. A straight conducting rod of length l and mass m is suspended in a ho...

    Text Solution

    |

  2. A constant current I is maintained in a solenoid. Which of lthe follo...

    Text Solution

    |

  3. As the frequency of an ac circuit increases, the current first increas...

    Text Solution

    |

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

    Text Solution

    |

  5. A proton and an alpha particle move in circular orbits in a uniform ma...

    Text Solution

    |

  6. A coil of area 100 cm^(2) is kept and angle of 30^(@) with a magnetic...

    Text Solution

    |

  7. A 15 Omega resistor , an 80 mH inductor and a capacitor of capacitanc...

    Text Solution

    |

  8. Four objects W, X, Y and Z each with charge +q are held fixed at four ...

    Text Solution

    |

  9. Two sources of equal emf are connected to an external resistance R. Th...

    Text Solution

    |

  10. Which of the following statements is correct?

    Text Solution

    |

  11. The equivalent resistance between A and B of the network shown in figu...

    Text Solution

    |

  12. A bar magnet has magnetic dipole moment vecM. Its initial position is ...

    Text Solution

    |

  13. Two charges 14 muC and -4 muC are placed at (-12 cm, 0, 0) and (12 cm,...

    Text Solution

    |

  14. A 300 Omega resistor and a capacitor of (25/pi)muF are connected in se...

    Text Solution

    |

  15. The core of a transformer is laminated to reduce

    Text Solution

    |

  16. Assertion (A) : A negative charge in an electric field moves along the...

    Text Solution

    |

  17. Assertion : We cannot make a magnet with only one pole. Reason : Ma...

    Text Solution

    |

  18. Assertion: When radius of circular loop carrying current is doubled, i...

    Text Solution

    |

  19. Assertion : Higher the range, greater is the resistance of ammeter. ...

    Text Solution

    |

  20. Assertion (A) : A step - up transformer cannot be used as a step- down...

    Text Solution

    |