Home
Class 12
PHYSICS
The current i flows in a wire of circula...

The current i flows in a wire of circular cross-section with the free electrons travelling with a drift velocity v. What is the drift velocity of electrons when a current of 2 i flows in another wire of twice the radius and of the same material ?

A

`vecV`

B

`(vecV)/(2)`

C

`(vecV)/(4)`

D

`2vecV`

Text Solution

Verified by Experts

The correct Answer is:
C
`V_(d)prop(1)/(r^(2))`
Promotional Banner

Topper's Solved these Questions

  • CURRENT ELECTRICITY

    NARAYNA|Exercise Level 2 C.W|59 Videos

  • CURRENT ELECTRICITY

    NARAYNA|Exercise Level 2 H.W|45 Videos

  • CURRENT ELECTRICITY

    NARAYNA|Exercise Level 1 C.W|64 Videos

  • COMMUNICATION SYSTEM

    NARAYNA|Exercise Level-II(H.W)|25 Videos

  • DUAL NATURE OF RADIATION AND MATTER

    NARAYNA|Exercise ASSERTION AND REASON|15 Videos

Similar Questions

Explore conceptually related problems

A current flows in a wire of circular cross section with the free electrons travelling with drift velocity vecV . If an equal current flows in a wire of twice the radius, new drift velocity is

In a wire of cross-section radius r , free electrons travel with drift velocity v when a current I flows through the wire. What is the current in another wire of half the radius and of the same material when the drift velocity is 2v ?

Drift velocity of free electrons when current passes through the conductor is of the order of

A steady current is set up in a metalic wire of non- uniform cross-section. How is the rate of flow free electrons related

If the current flowing in a copper wire be allowed to flow in another copper wire of same length but of doubled the radius, then what will be the effect on the drift velocity of the electrons. If the same current be allowed to flow in an iron wire of the same thickness, then ?

If the current flowing in a copper wire be allowed to flow in another copper wire of double the radius, then what will be the effect on the drift velocity of the electrons? If the same current be allowed to flow in an iron wire of the same thickness, then?

There is a current of "4.0A" in a wire of cross-sectional area 10^(-6)m^(2) .If the free electron density in wire is 10^(28)m^(-3) ,the drift velocity is :

There is a current of 40 A in a wire 10^(-6)m^(2) area of cross-section. If the number of free electrons per cubic metre is 10^(29) , then the drift velocity is :

Assertion: A current flows in a conductor only when there is an electric field within the conductor: Reason: The drift velocity of electron in presence of electric field decreases.

NARAYNA-CURRENT ELECTRICITY-Level 1 H.W
  1. A current of 1.6 A is flowing in a conductor. The number of electrons ...

    Text Solution

    |

  2. If an electron revolves in the circular path of radius 0.5A^(@) at a f...

    Text Solution

    |

  3. The current i flows in a wire of circular cross-section with the free ...

    Text Solution

    |

  4. Three resistances each of 3Omega are connected as shown in fig. the re...

    Text Solution

    |

  5. Two wires made of same material have lengths in the ratio 1:2 and thei...

    Text Solution

    |

  6. Two wires made of same material have their electrical resistances in t...

    Text Solution

    |

  7. There are five equal resistors. The minimum resistance possible by the...

    Text Solution

    |

  8. An electric current is passed through a circuit containing two wires o...

    Text Solution

    |

  9. A current of 1 A is passed through two resistances 1Omega and 2Omega c...

    Text Solution

    |

  10. The colour coded resistance of carbon resistance is (initial three ban...

    Text Solution

    |

  11. The resistance of a wire is 10 ohm. The resistance of a wire whose len...

    Text Solution

    |

  12. The resultant resistance of two resistors when connected in series is ...

    Text Solution

    |

  13. The resistance of a bulb filmanet is 100Omega at a temperature of 100^...

    Text Solution

    |

  14. The current i in the circuit given aside is

    Text Solution

    |

  15. The combined resistance of two conductors in series is 1Omega. If the ...

    Text Solution

    |

  16. When two resistance are connected in parallel then the equivalent resi...

    Text Solution

    |

  17. A material 'B' has twice the specific resistance of 'A'. A circular wi...

    Text Solution

    |

  18. If a wire of resistance R is melted and recasted in to half of its len...

    Text Solution

    |

  19. When a wire drawn until its radius decreases by 3% then percentage of ...

    Text Solution

    |

  20. When three wires of unequal resistances are given the number of combin...

    Text Solution

    |