Home
Class 12
PHYSICS
A material 'B' has twice the specific re...

A material 'B' has twice the specific resistance of 'A'. A circular wire made of 'B' has twice the diameter of a wire made of 'A'. Then for the two wires to have the same resistance, the ratio `l_(B)//l_(A)` of their respective lengths must be

A

1

B

`(1)/(2)`

C

`(1)/(4)`

D

`(2)/(1)`

Text Solution

Verified by Experts

The correct Answer is:
D
`R=(rhol)/(A)impliesl=(RA)/(rho)implieslprop(r^(2))/(rho)`
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

Two wires made of same material have lengths in the ratio 1:2 and their volumes in the same ratio. The ratio of their resistances is

Two wires of the same material are given. The first wire is twice as long as the second and has twice the diameter of the second. The resistance of the first will be

Four wires made of same material have different lengths and radii, the wire having more resistance in the following case is

The resistance of a wire of length l and diameter d is R . The wire is stretched to double its length. The resistance of the wire will now be

A certain wire has a resistance R. What is the resistance of a second wire, made of the same material, that is twice as long and has twice the diameter?

The resistance of a wire of uniform diameter d and length L is R . The resistance of another wire of the same material but diameter 2d and length 4L will be

NARAYNA-CURRENT ELECTRICITY-Level 1 H.W
  1. The combined resistance of two conductors in series is 1Omega. If the ...

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

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

    Text Solution

    |

  7. The resistance of a coi is 4.2Omega at 100^(@)C and the temperature co...

    Text Solution

    |

  8. You are given several identical resistors each of value 10Omega and ea...

    Text Solution

    |

  9. A wire of resistance 50Omega is cut into six equal parts and they are ...

    Text Solution

    |

  10. A technician has only two resistance coils. By using them in series or...

    Text Solution

    |

  11. The effective between A&B in the given circuit is

    Text Solution

    |

  12. The effective resistance between A and B is 3Omega then the value of R...

    Text Solution

    |

  13. The effective resistance between A and B in the given circuit is

    Text Solution

    |

  14. An electric bulb is rated 220 volt - 100 watt. The power consumed by i...

    Text Solution

    |

  15. A heater coil is cut into two parts of equal length and one of them is...

    Text Solution

    |

  16. if the electrc current in a lamp decreases by 5% then the power output...

    Text Solution

    |

  17. Two electric bulbs whose resistances are in the ratio of 1:2 are conne...

    Text Solution

    |

  18. A bulb rated 60 W-120 V is connected to 80 V mains. What is the curren...

    Text Solution

    |

  19. An electric bulb has the folloiwng specifications 100 watt, 220 volt. ...

    Text Solution

    |

  20. A 200 W and 100 W bulbs, both meant for operation at 220 V, are connec...

    Text Solution

    |