Home
Class 12
PHYSICS
A wire fixed at the upper end stretches ...

A wire fixed at the upper end stretches by length l by applying a force F. The work done in stretching is :

A

`F/(2l)`

B

`(Fl)/2`

C

`2Fl`

D

Fl

Text Solution

Verified by Experts

The correct Answer is:
B
Work done `=1/2` Stress `xx` Strain `xx` Volume
`=1/2F/Axxl/LxxAL`
`=1/2Fl`
Thus correct choice is (b).
Promotional Banner

Topper's Solved these Questions

  • PROPERTIES OF MATTER

    MODERN PUBLICATION|Exercise MULTIPLE CHOICE QUESTIONS (LEVEL-II)|72 Videos

  • PROPERTIES OF MATTER

    MODERN PUBLICATION|Exercise MULTIPLE CHOICE QUESTIONS (LEVEL-III)|13 Videos

  • OSCILLATIONS

    MODERN PUBLICATION|Exercise RCQ|7 Videos

  • RAY OPTICS

    MODERN PUBLICATION|Exercise RECENT COMPETITIVE QUESTION|32 Videos

Similar Questions

Explore conceptually related problems

A spring is stretched by applying a load to its free end . The strain produced in the spring is

Give the expression for work done per unit volume in stretching a wire.

When a rubber-band is stretched by a distance x, it exerts a restoring force of magnitude F = ax + bx2 where a and b are constants. The work done in stretching the unstretched rubber band by L is :

If two springs S, and S, of force constants k, and ky, respectively, are stretched by the same force, it is found that more work is done on spring S, than on spring S. Statement 1: If stretched by the same amount, work done on S, will be more than that on S. Statement 2: k_1 lt k_2

A spring is hanging from a rigid support. A force of 2000 dynes applied verticlly downwards at the lower end of the spring, extends it by 5 cm. The work done is given by:

A wire of length L radius r when stretched with a force F changes in length by l. What will be the change in the length of a wire of same material having length 2 L radius 2 r and stretched by a force 2 F ?

MODERN PUBLICATION-PROPERTIES OF MATTER-RECENT COMPETITIVE QUESTIONS
  1. A wire fixed at the upper end stretches by length l by applying a forc...

    Text Solution

    |

  2. Which of the following substances has the highest elasticity ?

    Text Solution

    |

  3. Three liquids of equal masses are taken in three identical cubical ves...

    Text Solution

    |

  4. Water is in streamline flow along a horizontal pipe with nonuniform cr...

    Text Solution

    |

  5. The following four wires of length L and radius r are made of the same...

    Text Solution

    |

  6. Eight equal drops of water are falling through air with a steady veloc...

    Text Solution

    |

  7. Two capillary tubes of diffemt diameters are dipped in water. The rise...

    Text Solution

    |

  8. Milk is an example for

    Text Solution

    |

  9. Spheres of iron and lead having same mass are completely immersed in w...

    Text Solution

    |

  10. Two solids P and Q float in water. It is observed that P floats with h...

    Text Solution

    |

  11. A flow of liquid is streamline if the Reynold number is

    Text Solution

    |

  12. In anomalous expansion of water, at what temperature, the density of w...

    Text Solution

    |

  13. The ratio of hydraulic stress to the corresponding strain is known as

    Text Solution

    |

  14. What is heated from 0°C to 10°C, then its volume

    Text Solution

    |

  15. A crane with a steel cable of length 11 m and radius 2.0 cm is employe...

    Text Solution

    |

  16. The dimensions of four wires of the same material are given below. In ...

    Text Solution

    |

  17. Under a constant pressure head, the rate of flow of orderly volume flo...

    Text Solution

    |

  18. The average energy of molecules in a sample of oxygen gas at 300K are ...

    Text Solution

    |