Home
Class 12
PHYSICS
The number density of conduction electro...

The number density of conduction electrons in a copper conductor is `8.5xx10^(28) m^(-3)`. How long does an electron take to drift from one end of a wire 3.0 m long to its other end ? The area of cross-section of the wire is `2.0xx10^(-6) m^(2)` and it is carrying a current of 3.0 A.

A

`2.73xx10^(4)s`

B

`4.73xx10^(4)s`

C

`5xx10^(4)s`

D

`6xx10^(8)s`

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • CURRENT ELECTRICITY

    DC PANDEY|Exercise Taking it together|142 Videos

  • CURRENT ELECTRICITY

    DC PANDEY|Exercise B. Assertion and reason|18 Videos

  • CURRENT ELECTRICITY

    DC PANDEY|Exercise Example|61 Videos

  • COMMUNICATION SYSTEM

    DC PANDEY|Exercise Subjective|11 Videos

  • ELECTROMAGNETIC INDUCTION

    DC PANDEY|Exercise Medical entrances gallery|25 Videos

Similar Questions

Explore conceptually related problems

The number density of free electrons in a copper conductor is estimated at 8.5 xx 10^(28) m^(-3) . How long does an electron take to drift from one end of a wire 3.0 m long to its other end? The area of cross-section of the wire is 2.0 xx 10^(-6)m^(2) and it is carrying a current of 3.0A.

A current of 4.8 A is flowing in a copper wire of cross-sectional area 3xx10^(-4) m^(2) . Find the current density in the wire.

The number density of electron in copper is 8.5 xx10^(28)m^(-3) . Find the current flowing through a copper wire of length 20 cm, area of cross section is 1 mm square,when connected to a battery of 3 V. Given the electron mobility =4.5xx10^(-6)m^(2)V^(-1) s^(-1) and electron charge =1.6 xx 10^(-19)C .

Calculate the average drift speed of conduction electrons in a copper wire of cross-sectional area 1.0xx10^(-7)m^(2) , carrying a current of 1.5 A. Assume that each copper atom contributes roughly one conduction electron. The density of copper is 9.0xx10^(3) kg m^(-3) and its atomic mass is 63.5. Take Avogadro's number =6.0xx10^(23) .

Estimate the average drift speed of conduction electrons in a copper wire of cross-sectional area 2.0 xx 10^(-7)m^(2) carrying a current of 3.0 A. Assume that each copper atom contributes roughly one conduction electron. The density of copper is 9.0 xx10^(3) kg//m^(3) , and its atomic mass is 63.5 u.

(a) Estimate the average drift speed of conductin electrons in a copper wire of cross sectional area 1.0xx10^(-7) m^2 carrying a current of 1.5 A. Assume that each copper atom contributes roughly one conduction electron. The density of copper is 9.0xx10^3 kgm^(-3) and its atomic mass is 63.5 u. (b) Compare the drift speed obtained with the speed of propagation of electric field along the conductor, which causes the drift motion.

A bob of mass 10 kg is attached to wire 0.3 m long. Its breaking stress is 4.8 xx 10^(7) N//m^(2) . The area of cross section of the wire is 10^(-6) m^(2) . The maximum angular velocity with which it can be rotated in a horizontal circle

DC PANDEY-CURRENT ELECTRICITY-Check point
  1. When current flows through a conductor, then the order of drift veloci...

    Text Solution

    |

  2. The drift velocity does not depend upon

    Text Solution

    |

  3. The number density of conduction electrons in a copper conductor is 8....

    Text Solution

    |

  4. Calculate the amount of charge flowing in 2 minutes in a wire of resi...

    Text Solution

    |

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

    Text Solution

    |

  6. The following four wires are made of the same material. Which of these...

    Text Solution

    |

  7. Carbon resistors, used in electronic circuits are marked for their val...

    Text Solution

    |

  8. The potential difference between points A and B of the following figur...

    Text Solution

    |

  9. Resistances of 6 ohm each are connected in the manner shown in adjoini...

    Text Solution

    |

  10. In the figure given below, the current passing through 6Omega resisto...

    Text Solution

    |

  11. Current through 3Omega resistor is 0.8A, then potential drop through 4...

    Text Solution

    |

  12. Current I as shown in the circuit will be

    Text Solution

    |

  13. In the circuit, the current flowing through 10Omega resistance is

    Text Solution

    |

  14. If all the resistors shown have the value 2 ohm each, the equivalent r...

    Text Solution

    |

  15. The reading of the ammeter as per figure shown is

    Text Solution

    |

  16. The current from the battery in circuit diagram shown is

    Text Solution

    |

  17. In the circuit shown, the point B is earthed. The potential at the poi...

    Text Solution

    |

  18. In the circuit shown, potential difference between X and Y will be

    Text Solution

    |

  19. A current of 2.0 ampere passes through a cell of e.m.f. 1.5 volts h...

    Text Solution

    |

  20. If V(AB) = 4V in the given fig are, then resistance chi will be

    Text Solution

    |