Home
Class 11
PHYSICS
A hollow metallic sphere of radius 20cm ...

A hollow metallic sphere of radius `20cm` surrounds a concentric metallic sphere of radius `5cm`. The space between the two sphere is filled with a nonmetallic material. The inner and outer sphere are maintained at `50^(@)C` and `10^(@)C` respectively and it is found that `100J` of heat passes from the inner sphere to the outer sphere per second. Find the thermal conductivity of the material between the sphere.

Text Solution

Verified by Experts

The correct Answer is:
`15 W//m-^(@)C`
Promotional Banner

Topper's Solved these Questions

  • HEAT TRANSFER

    RESONANCE ENGLISH|Exercise Exercise-2|1 Videos

  • HEAT TRANSFER

    RESONANCE ENGLISH|Exercise Exercise-3|1 Videos

  • HEAT TRANSFER

    RESONANCE ENGLISH|Exercise Exercise-1|1 Videos

  • GRAVITATION

    RESONANCE ENGLISH|Exercise Exercise|21 Videos

  • KINEMATICS

    RESONANCE ENGLISH|Exercise Exercise|65 Videos

Similar Questions

Explore conceptually related problems

A hollow metal sphere of radius 5 cm is charged so that the potential on its surface is 10 V . The potential at the centre of the sphere is

A hollow metal sphere of radius 10cm is charged such that the potential on its surface is 80 V. The potential at the centre of the sphere is

A hollow metal sphere of radius 10cm is charged such that the potential on its surface is 80 V. The potential at the centre of the sphere is

A hollow metal sphere of radius 10 cm is charged such that the potential on its surface is 5 V. What is the potential at the centre of the sphere?

A hollow metal sphere of radius 10 cm is charged such that the potential on its surface is 5 V. What is the potential at the centre of the sphere?

Two smooth sphere each of radius 5cm and weight W rest one on the other inside a fixed smooth cylinder of radius 8cm. The reaction between the sphere and the vertical side of the cylinder are:

Two smooth sphere each of radius 5cm and weight W rest one on the other inside a fixed smooth cylinder of radius 8cm. The reaction between the sphere and the vertical side of the cylinder are:

A metallic solid sphere of radius 9 cm is melted to form a solid cylinder of radius 9 cm. Find the height of the cylinder.

A sphere of 4 cm radius is suspended within a hollow sphere of 6 cm radius. The inner sphere is charged to potential 3 e.s.u. and the outer sphere is earthed. The charge on the inner sphere is

A sphere of 4 cm radius is suspended within a hollow sphere of 6 cm radius. The inner sphere is charged to potential 3 e.s.u. and the outer sphere is earthed. The charge on the inner sphere is

RESONANCE ENGLISH-HEAT TRANSFER-Exercise
  1. A semicircular rods is joined at its end to a straight rod of the same...

    Text Solution

    |

  2. Three slabs of same surface area but different conductivities k(1),k(2...

    Text Solution

    |

  3. A hollow metallic sphere of radius 20cm surrounds a concentric metalli...

    Text Solution

    |

  4. A hollow tube has a length l, inner radius R(1) and outer radius R(2) ...

    Text Solution

    |

  5. A metal rod of cross sectional area 1.0cm^(2) is being heated at one e...

    Text Solution

    |

  6. When q(1) joules of radiation is incident on a body if reflects and tr...

    Text Solution

    |

  7. A blackbody of surface area 1cm^(2) is placed inside an enclosure. The...

    Text Solution

    |

  8. Estimate the temperature at which a body may appear blue or red. The v...

    Text Solution

    |

  9. The temperature of a hot liquid in a container of negligible heat capa...

    Text Solution

    |

  10. The earth receives its surface radiation from the sun at the rate of 1...

    Text Solution

    |

  11. A solid copper sphere (density rho and specific heat c) of radius r a...

    Text Solution

    |

  12. A liquid cools from 70^(@)C to 60^(@)C in 5 minutes. Calculate the tim...

    Text Solution

    |

  13. A wall has two layers A and B, each made od=f different material. Both...

    Text Solution

    |

  14. Two metal cubes with 3 cm edges of copper and aluminium are arranged a...

    Text Solution

    |

  15. Two metal cubes with 3 cm edges of copper and aluminium are arranged a...

    Text Solution

    |

  16. A wall consists of alternating blocks with length 'd' and coefficient ...

    Text Solution

    |

  17. A boiler is made of a copper plate 2.4mm thick with an inside coating ...

    Text Solution

    |

  18. A lake surface is exposed to an atmosphere where the temperature i...

    Text Solution

    |

  19. Heat flows radially outward through a spherical shell of outside radiu...

    Text Solution

    |

  20. A solid metallic sphere of diameter 20 cm and mass 10 kg is heated to ...

    Text Solution

    |