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

`1/4`

B

2

C

1

D

`1/2`

Text Solution

Verified by Experts

The correct Answer is:
B
Promotional Banner

Topper's Solved these Questions

  • CURRENT ELECTRICITY

    MOTION|Exercise EXAMPLE|79 Videos

  • CURRENT ELECTRICITY

    MOTION|Exercise EXERCISE -1 (SECTION -A Definition of Current , Current Density , Drift Velocity )|8 Videos

  • CURRENT ELECTRICITY

    MOTION|Exercise EXERCISE -3 SECTION -A (PREVIOUS YEAR PROBLEMS NEET)|34 Videos

  • CONSTRAINED MOTION

    MOTION|Exercise EXAMPLES|12 Videos

  • ELASTICITY

    MOTION|Exercise EXERCISE -3|60 Videos
MOTION-CURRENT ELECTRICITY-EXERCISE -3 SECTION -B (PREVIOUS YEAR PROBLEMS JEE MAIN)
  1. Two sources of equal emf are connected to an external resistance R. Th...

    Text Solution

    |

  2. An energy source will supply a constant current into the load if its i...

    Text Solution

    |

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

    Text Solution

    |

  4. The Kirchhoff's first law (Sigmai = 0) and second law (SigmaiR = Sigma...

    Text Solution

    |

  5. The current I drawn from the 5 volt source will be

    Text Solution

    |

  6. In a Wheatstone's bridge, three resistances P,Q and R connected in the...

    Text Solution

    |

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

    Text Solution

    |

  8. The resistance of a wire is 5 ohm at 50^@C and 6 ohm at 100^@C. The re...

    Text Solution

    |

  9. A 5V battery with internal resistance 2Omega and a 2V battery with int...

    Text Solution

    |

  10. Consider a block of conducting material of resistivity 'rho' shown in ...

    Text Solution

    |

  11. Consider a block of conducting material of resistivity 'rho' shown in ...

    Text Solution

    |

  12. Statement-1: The temperature dependence of resistance is usually given...

    Text Solution

    |

  13. Two conductors have the same resistance at 0^@C but their temperature ...

    Text Solution

    |

  14. If a copper wire is stretched to make it 0.1% longer wha is the percen...

    Text Solution

    |

  15. Two electric bulbs marked 25W-220V and 100W-220V are connected in seri...

    Text Solution

    |

  16. If 400 Omega of resistance is made by adding four 100 Omega resistance...

    Text Solution

    |

  17. The current in the primary circuit of a potentiometer is 0.2 A. The sp...

    Text Solution

    |

  18. If a copper wire is stretched to make it 0.1% longer wha is the percen...

    Text Solution

    |

  19. Two electric bulbs marked 25W-220V and 100W-220V are connected in seri...

    Text Solution

    |

  20. Resistance of a given wire is obtained by measuring the current flowin...

    Text Solution

    |