Home
Class 12
PHYSICS
Two copper wire of length l and 2l have ...

Two copper wire of length l and 2l have radii, r and 2r respectively. What si the ratio of their specific resistance.?

A

`1:2`

B

`2:1`

C

`1:1`

D

`1:3`

Text Solution

Verified by Experts

The correct Answer is:
C
The specific resistance `(rho)` is the characteristic of the material of conductor. Its value depends only on the material of conductor and its temperature. Its value does not depend on the length and area of cross-section of the conductor. If a wire is stretched or doubled on itself, it resistance will change, but its specific resistance will remain unaffected.
Promotional Banner

Topper's Solved these Questions

  • CURRENT ELECTRICITY

    MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS|Exercise EXERCISE 2|26 Videos

  • CURRENT ELECTRICITY

    MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS|Exercise MHT CET CORNER|32 Videos

  • CURRENT ELECTRICITY

    MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS|Exercise MHT CET CORNER|32 Videos

  • COMMUNICATION SYSTEM

    MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS|Exercise MHC CET Corner|6 Videos

  • ELASTICITY

    MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS|Exercise MHT CET CORNER|16 Videos

Similar Questions

Explore conceptually related problems

Two wire of copper have length L and 2L and cross section 2A and A respectively .The ratio of their specific resistance would be would be

Two wires of same material have length L and 2 L and cross– sectional areas 4 A and A respectively. The ratio of their specific resistance would be

Two copper wires A and B of length 30 m and 10 m have radii 2 cm and 1 cm respectively. Compare the resistances of the two wires. Which will have less resistance ?

Two uniform brass rods A and B of lengths l and 2l and radii 2r and r respectively are heated to the same temperature. The ratio of the increase in the length of A to that of B is :

Two wires of same material and same length have radii r_1 and r_2 respectively. Compare their resistances.

Two copper wires A and B of length l and 2l respectively, have the same area of cross-section. The ratio of the resistivity of wire A to the resistivity of wire B is

MHTCET PREVIOUS YEAR PAPERS AND PRACTICE PAPERS-CURRENT ELECTRICITY-EXERCISE 1
  1. The resistance of a bulb filmanet is 100Omega at a temperature of 100^...

    Text Solution

    |

  2. All the edges of a block with parallel faces are unequal. Its longest ...

    Text Solution

    |

  3. Two copper wire of length l and 2l have radii, r and 2r respectively. ...

    Text Solution

    |

  4. Which of the following materials is the best conductor of electricity ...

    Text Solution

    |

  5. Electric field (E) and current density (J) have relation

    Text Solution

    |

  6. The temperature (T) dependence of resistivity (rho) of a semiconductor...

    Text Solution

    |

  7. A current 4.0 A exist in a wire of cross-sectional area 2.0 mm^(2). If...

    Text Solution

    |

  8. A wire of resistance R is elongated n-fold to make a new uniform wire....

    Text Solution

    |

  9. The four colours on a resistor are: brown, yellow, green and gold as r...

    Text Solution

    |

  10. The resistance will be least in a wire with length, cross-section area...

    Text Solution

    |

  11. A wire has resistance of 10Omega. If it is stretched by 1/10th of its ...

    Text Solution

    |

  12. If resistivity of copper conductor is 1.7xx10^(-8) Omega -m and electr...

    Text Solution

    |

  13. A wire is stretched so as to change its diameter by 0.25% . The percen...

    Text Solution

    |

  14. A potential difference of 100 V is applied to the ends of a copper wir...

    Text Solution

    |

  15. If power dissipated in the 9 Omega resistor in the resistor shown is 3...

    Text Solution

    |

  16. The effective resistance between points A and C for the network shown ...

    Text Solution

    |

  17. A resistor of 6k Omega with tolerance 10% and another resistance of 4k...

    Text Solution

    |

  18. In the circuit given E = 6.0 volt, R(1) = 100Omega, R(2) = R(3)=50Omeg...

    Text Solution

    |

  19. The circuit in figure, where there are three resistors R(1),R(2) and R...

    Text Solution

    |

  20. The resistance across R and Q in the figure is

    Text Solution

    |