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)tauA)`

B

`(mtauA)/("ne"^(2)l)`

C

`("ne"^(2)tauA)/(ml)`

D

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

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • CAPACITANCE

    PHYSICS GALAXY - ASHISH ARORA|Exercise UNSOLVED NUMERICAL PROBLEMS|40 Videos

  • ELECTROMAGNETIC INDUCTION AND ALTERNATING CURRENT

    PHYSICS GALAXY - ASHISH ARORA|Exercise Advance MCQs|33 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.

PHYSICS GALAXY - ASHISH ARORA-CURRENT ELECTRICITY-All Questions
  1. In a circuit containing two unequal resistors connected in parallel :

    Text Solution

    |

  2. Two wires A an dB of the same material, having radii in the ratio I : ...

    Text Solution

    |

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

    Text Solution

    |

  4. If R(1) and R(2) are respectively the filament resistances of a 200 wa...

    Text Solution

    |

  5. When a current flows in a conductor, the order of magnitude of drift v...

    Text Solution

    |

  6. A piece of wire is cut into four equal parts and the pieces are bundle...

    Text Solution

    |

  7. A cylindrical copper rod is reformed to twice its original length with...

    Text Solution

    |

  8. Variation of current and voltage in a conductor has been shown in the ...

    Text Solution

    |

  9. A charged capacitor is discharged through a resistance. The time const...

    Text Solution

    |

  10. A capacitor of capacitance C is charge by a battery of emf E and inter...

    Text Solution

    |

  11. For the circuit shown in the figure, find the charge stored on capacit...

    Text Solution

    |

  12. The switch shown n the figure is closed at t=0. The charge on the cap...

    Text Solution

    |

  13. A capacitor C is connected to two equal resistances as shown in the fi...

    Text Solution

    |

  14. In the circuit diagram the current through the battery immediately aft...

    Text Solution

    |

  15. In the circuit shown, switch Sis closed att=O. Let i(1) and i(2) be th...

    Text Solution

    |

  16. A lmuF capacitor is connected in the circuit shown below. The EMF of t...

    Text Solution

    |

  17. In the circuit shown in figure-3.311, the switch is shifted from posit...

    Text Solution

    |

  18. The capacitor shown in figure-3.312-(a) is charged to steady state by ...

    Text Solution

    |

  19. The deflection in a galvanometer fulls from 50 divisions to 20 divisio...

    Text Solution

    |

  20. If 2% of the main current is to be passed through the galvanometer of ...

    Text Solution

    |