Home
Class 12
PHYSICS
If the electron drift speed is so small ...

If the electron drift speed is so small ` (~ 10 ^(-3) m//s) ` and the electron’s charge is very small, how can we still obtain a large amount of current in a conductor.

Text Solution

Verified by Experts

The electron number density is of the order of `10 ^(29) m^(-3) , rArr` the net current can be very high even if the drift spread is low.
Promotional Banner

Topper's Solved these Questions

  • ELECTROSTATICS AND CURRENT ELECTRICITY

    CBSE COMPLEMENTARY MATERIAL|Exercise SHORT ANSWER QUESTIONS (3 MARKS )|23 Videos
  • ELECTROSTATICS AND CURRENT ELECTRICITY

    CBSE COMPLEMENTARY MATERIAL|Exercise LONG ANSWER QUESTIONS|6 Videos
  • ELECTROSTATICS AND CURRENT ELECTRICITY

    CBSE COMPLEMENTARY MATERIAL|Exercise NUMERICALS|49 Videos
  • ELECTRONIC DEVICES

    CBSE COMPLEMENTARY MATERIAL|Exercise NUMERICALS|7 Videos
  • SAMPLE QUESTION PAPER 2019

    CBSE COMPLEMENTARY MATERIAL|Exercise Section C|19 Videos

Similar Questions

Explore conceptually related problems

(a) In Example 3.1, the electron drift speed is estimated to be only a few mm s^(-1) for currents in the range of a few amperes? How then is current established almost the instant a circuit is closed? (b) The electron drift arises due to the force experienced by electrons in the electric field inside the conductor. But force should cause acceleration. Why then do the electrons acquire a steady average drift speed? (c) If the electron drift speed is so small, and the electron’s charge is small, how can we still obtain large amounts of current in a conductor? (d) When electrons drift in a metal from lower to higher potential, does it mean that all the ‘free’ electrons of the metal are moving in the same direction? (e) Are the paths of electrons straight lines between successive collisions (with the positive ions of the metal) in the (i) absence of electric field, (ii) presence of electric field?

The speed of the electron in the first orbit is 2.182 xx 10^(6) m//s , the speed of electron in the third orbit is

Is drift speed of electrons in a conductor carrying current the same as the speed of current ?

Assertion: Drift velocity of electrons developed in a current-carrying conductor is of the order of 10^(-4) m//s but current in the conductor is established almost instantly the switch is closed. Reason: Electric field in a conductor sets up with the speed of light.

If the value of drift speed of electrons inside a conduct is very low , can we measure it with the help of a microscope ?

CBSE COMPLEMENTARY MATERIAL-ELECTROSTATICS AND CURRENT ELECTRICITY -SHORT ANSWER QUESTIONS (2 MARKS)
  1. A battery has an emf of 12V and an internal resistance of 2 Omega. C...

    Text Solution

    |

  2. In a potentiometer arrangment, a cell of emf 1.25 V gives a balance po...

    Text Solution

    |

  3. In a meter bridge, the balance point is found to be 39.5 cm from end A...

    Text Solution

    |

  4. A meterbridge is in balance condition. Now if galvanometer and cell ar...

    Text Solution

    |

  5. If the emf of the driving cell be decreased, what will be effect on th...

    Text Solution

    |

  6. Why should the area of cross-section of the meter-bridge wire be unifo...

    Text Solution

    |

  7. Given any two limitations of Ohm’s law.

    Text Solution

    |

  8. Which one of the two, an ammeter or a milliammeter, has a higher resis...

    Text Solution

    |

  9. Name two factors on which the resistivity of a given material depends ...

    Text Solution

    |

  10. If the electron drift speed is so small (~ 10 ^(-3) m//s) and the e...

    Text Solution

    |

  11. A battery of emf 2.0 volts and internal resistance 0.1 Omega is bein...

    Text Solution

    |

  12. Why should the jockey be not rubbed against potentiometer wire ?

    Text Solution

    |

  13. What is meant by the sensitivity of a potentiometer of any given lengt...

    Text Solution

    |

  14. Five identical cells, each of emf E and internal resistance r, are con...

    Text Solution

    |

  15. An electron in a hydrogen atom is considered to be revolving around a ...

    Text Solution

    |

  16. In the given circuit, with steady current, calculate the potential dro...

    Text Solution

    |

  17. .A cell of emf E and internal resistance r is connected across a varia...

    Text Solution

    |

  18. Winding of rheostat wire are quite close to each other why do not they...

    Text Solution

    |

  19. Why is it necessary to obtain the balance point in the middle of bridg...

    Text Solution

    |

  20. What are the possible cause of one side deflection in Galvanometer whi...

    Text Solution

    |