Home
Class 12
PHYSICS
The drift velocity of electrons in a wir...

The drift velocity of electrons in a wire of radius r is proportional to

A

r

B

`r^(2)`

C

`r^(3)`

D

none of the above

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Topper's Solved these Questions

  • CURRENT ELECTRICITY

    FULL MARKS|Exercise Additional Questions Solved (Fill in the blanks)|39 Videos

  • CURRENT ELECTRICITY

    FULL MARKS|Exercise Additional Questions Solved (Match the following)|4 Videos

  • CURRENT ELECTRICITY

    FULL MARKS|Exercise TEXTBOOK EVALUATION (Numerical Problems)|15 Videos

  • COMMUNICATION SYSTEMS

    FULL MARKS|Exercise ADDITIONAL QUESTIONS  (Additional problems)|3 Videos

  • DUAL NATURE OF RADIATION AND MATTER

    FULL MARKS|Exercise ADDITIONAL QUESTIONS -( ADDITIONAL NUMERICAL PROBLEMS : )|10 Videos

Similar Questions

Explore conceptually related problems

Define drift velocity.

The density of electrons in copper is 8.4 xx 10^(22) per cm^(3) ? Calculate the drift velocity of electrons in a copper wire of 2 mm^(2) - area of cross section and carries a current of 0.15 A.

In a semiconductor (2)/(3) rd of the total current is carried by electrons and remaining (1)/(3) rd by the holes . If at this temperature , the drift velocity of electrons is 3 times that of holes , the ratio of number density of electrons to that of holes is

What is the drift velocity of an electron in a copper conductor having area 10 xx 10^(-6) m^2 , carrying a current of 2A. Assume that there are 10 xx 10^(28) electrons/ m^3 .

The kinetic energy of the electron in an orbit of radius r in hydrogen atom is (e = electronic charge)

The capacitor C of a spherical conductor of radius R is proportional to

FULL MARKS-CURRENT ELECTRICITY-Additional Questions Solved (Choose the correct answer)
  1. The reciprocal of resistance is ……………………….. .

    Text Solution

    |

  2. A student has 10 resistors, each of resistance r. The minimum resistan...

    Text Solution

    |

  3. The drift velocity of electrons in a wire of radius r is proportional ...

    Text Solution

    |

  4. Kirchoff'slaw i.e., sum i=0, at a junction, deals with the conservatio...

    Text Solution

    |

  5. The resistance of a material increases with temperature. It is a

    Text Solution

    |

  6. Five cells, each of emf E, are joined in parallel. The total emf of th...

    Text Solution

    |

  7. A carbon resistance has colour bands in order yellow, brown, red. Its ...

    Text Solution

    |

  8. What is the value of conductivity of a semiconductor at absolute zero ...

    Text Solution

    |

  9. Explain the determination of the internal resistance of the cell using...

    Text Solution

    |

  10. Carriers of electric current in superconductors are

    Text Solution

    |

  11. A. Potentiometer measures the potential difference more accurately tha...

    Text Solution

    |

  12. What is meant by electromotive force ?

    Text Solution

    |

  13. The capacitance of a pure capacitor is 1 farad. In DC circuit, the eff...

    Text Solution

    |

  14. The resistance of an ideal ammeter is .

    Text Solution

    |

  15. A milliammeter of range 10 mA has a coil of resistance 1Omega. To use ...

    Text Solution

    |

  16. A battery of emf 10 V and internal resistance 3Omega is connected to a...

    Text Solution

    |

  17. Good resistance coils are made of

    Text Solution

    |

  18. A wire of resistance R is stretched to three times its original length...

    Text Solution

    |

  19. n resistances, each of r Omega, when connected in parallel give an equ...

    Text Solution

    |

  20. When a wire of uniform cross-section, having resistance R, is bent int...

    Text Solution

    |