Home
Class 12
PHYSICS
A metal wire of circular cross-section h...

A metal wire of circular cross-section has a resistance `R_(1)`. The wire is now stretched without breaking, so that its length is doubled and the density is assumed to remain the same. If the resistance of the wire now becomes `R_(2)`, then `R_(2) : R_(1)` is

A

`1 : 1`

B

`1 : 2`

C

`4 : 1`

D

`1 : 4`

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • CURRENT ELECTRICITY

    DC PANDEY|Exercise Match the columns|4 Videos

  • COMMUNICATION SYSTEM

    DC PANDEY|Exercise Subjective|11 Videos

  • ELECTROMAGNETIC INDUCTION

    DC PANDEY|Exercise Medical entrances gallery|25 Videos

Similar Questions

Explore conceptually related problems

The resistance of a wire is 2 Omega . The wire is stretched to doubel its length. Now the resistance of the wire will become

If the area of cross-section of a resistance wire is halved, then its resistance becomes:

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

If a wire is stretched to double its length, find the new resistance if the original resistance of the wire was R.

A wire has a resistance R . What wil will be its resistance if it is stretched to double its length?

The resistance of wire is 20 Omega . The wire is stretched to three times its length. Then the resistance will now be

DC PANDEY-CURRENT ELECTRICITY-Medical entrances gallery
  1. A DC ammeter has resistance 0.1 Omega and its current ranges 0-100 A. ...

    Text Solution

    |

  2. The current I shown in the circuit is

    Text Solution

    |

  3. A metal wire of circular cross-section has a resistance R(1). The wire...

    Text Solution

    |

  4. Consider the combination of resistor, The equivalent resistance b...

    Text Solution

    |

  5. A potentiometer wire of length 100 cm having a resistance of 10 Omega ...

    Text Solution

    |

  6. Three resistances 2 Omega, 3 Omega and 4 Omega are connected in parall...

    Text Solution

    |

  7. Four identical cells of emf epsilon and internal resistance r are to b...

    Text Solution

    |

  8. In the circuit shown alongside, the ammeter and the voltmeter redings ...

    Text Solution

    |

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

    Text Solution

    |

  10. In a uniform ring of resistance R there are two points A and B such th...

    Text Solution

    |

  11. The dimensions of mobility of charge carriers are

    Text Solution

    |

  12. The temperature coefficient of resistance of an alloy used for making ...

    Text Solution

    |

  13. A wire of resistance 4 Omega is stretched to twice its original length...

    Text Solution

    |

  14. A carbon film resistor has cololur code green, black, violet, gold. Th...

    Text Solution

    |

  15. A uniform wire of resistance 9 Omega is joined end-to-end to from a ci...

    Text Solution

    |

  16. The equivalent resistance of two resistor connected in series is 6 Ome...

    Text Solution

    |

  17. Six resistance are connected as shown in figure. If total current flow...

    Text Solution

    |

  18. Four cells, each of emf E and internal resistance r, are connected in ...

    Text Solution

    |

  19. A circuit consists of three batteries of emf E(1) = 1V, E(2)=2V and E(...

    Text Solution

    |

  20. Two resistors of resistances 2Omega and 6Omega are connected in parall...

    Text Solution

    |