Home
Class 12
PHYSICS
A wire has a resistance R. Find new resi...

A wire has a resistance R. Find new resistance,
(i) if radius of cross-section of a cylindrical wire is doubled, then find ratio of initial to final resistance.
(ii) if length of wire is increased by `10%`, then find the percentage increase in its resistance.
(iii) if length of wire is increased by `20%`, then find the percentage increase in its resistance.

Promotional Banner

Topper's Solved these Questions

  • CURRENT ELECTRICITY

    DC PANDEY|Exercise Check point|70 Videos

  • CURRENT ELECTRICITY

    DC PANDEY|Exercise Taking it together|142 Videos

  • CURRENT ELECTRICITY

    DC PANDEY|Exercise Level 2 Subjective|13 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

When length of wire is increased by 10% , then increase in resistance is

On increasing the radius of a shpere by 10%, find the percentage increase in its volume

When a wire drawn until its radius decreases by 3% then percentage of increase in resistance is-

The wire is stretched to increase the length by 1%. Find the percentage change in the resistance.

If an increase in length of copper wire is 0.5% due to stretching, the percentage increase in its resistance will be

If an iron wire is drawn to decrease its radius by0.5% .Then percentage of increase in its resistance will be

If a 0.1 % increase in length due to stretching, the percentage increase in its resistance will be

A cylindrical wire is stretched to increase its length by 10%. The percentage increase in the resistance of the wire will be–

The length of the resistance wire is increased by 10%. What is the corresponding change in the resistance of wire

DC PANDEY-CURRENT ELECTRICITY-Example
  1. A current of 1.0 ampere is flowing through a copper wire of length 0.1...

    Text Solution

    |

  2. Find the relaxation time for free electrons in copper, if the density ...

    Text Solution

    |

  3. A wire has a resistance R. Find new resistance, (i) if radius of cro...

    Text Solution

    |

  4. The resistance of a thin silver wire is 1.0 Omega at 20^@C. The wire i...

    Text Solution

    |

  5. Resistance of platinum wire in a platinum resistance thermometer at me...

    Text Solution

    |

  6. The temperature coefficient of resistance of a wire is 0.00145^(@)C^(-...

    Text Solution

    |

  7. How will you repersent a resistance of 3700 Omega +- 10% by colour cod...

    Text Solution

    |

  8. A wire of resistance 6R is bent in the form of a circle. What is the e...

    Text Solution

    |

  9. Find the equivalent resistance between A and B in the following cases

    Text Solution

    |

  10. A letter A consists of a uniform wire of resistance 1 ohm per cm. The ...

    Text Solution

    |

  11. Find in the given network of resistors, the equivalent resistance betw...

    Text Solution

    |

  12. Find the effective resistance between points A and B for the network s...

    Text Solution

    |

  13. Find the equivalent resistance between A and B in the following case

    Text Solution

    |

  14. Find the equivalent resistance between A and B.

    Text Solution

    |

  15. Determine the current supplied by the battery in the circuit as shown ...

    Text Solution

    |

  16. Calculate the current shown by the ammeter A in the circuit shown in f...

    Text Solution

    |

  17. Find the equivalent resistance between A and B.

    Text Solution

    |

  18. The reading on a high resistance voltmeter when a cell is connected ac...

    Text Solution

    |

  19. A battery of emf 2 V and internal resistance r is connected in series ...

    Text Solution

    |

  20. A voltmeter of resistance 994Omega is connected across a cell of emf 1...

    Text Solution

    |