Home
Class 12
PHYSICS
A composite spherical shell is made up t...

A composite spherical shell is made up to two materials having thermal conductivities k and 2k respectively as shown in the diagram . The temperature at the innermost surface is maintained at T whereas the temperature at the outermost surface is maintained at 10 T . A, B, C and D are four points in the outer material such that AB = BC = CD.

The effective thermal resistance between the inner surface of the shell and the outer surface of the shell for the radial heat flow is

A

`1/(8piKR)`

B

`1/(7piKR)`

C

`1/(48piKR)`

D

`1/(49piKR)`

Text Solution

Verified by Experts

The correct Answer is:
C
Promotional Banner

Topper's Solved these Questions

  • NTA NEET SET 42

    NTA MOCK TESTS|Exercise PHYSICS|45 Videos

  • NTA NEET SET 44

    NTA MOCK TESTS|Exercise PHYSICS|45 Videos

Similar Questions

Explore conceptually related problems

Two walls of thickness d and d and thermal conductivities k and k are in contact. In the steady state, if the temperature at the outer T_(1) and T_(2) , the temperature at the common wall is

A composite cylinder is made of two materials having thermal conductivities K_(1) and K_(2) as shown. Temperature of the two flat faces of cylinder are maintained at T_(1) and T_(2) . For what ratio K_(1)//K_(2) the heat current throught the two materials will be same. Assume steady state and the rod is lagged (insulated from the curved surface).

Two identical rods are made of different materials whose thermal conductivities are K_(1) and K_(2) . They are placed end to end between two heat reservoirs at temperatures theta_(1) and theta_(2) . The temperature of the junction of the rod is

Two plates of same area are placed in contact. Their thickness as well as thermal conductivities are in the ratio 2:3 . The outer surface of one plate is maintained at 10^(@) C and that of the other at 0^(@) C. What is the temperature at the common surface?

If two conducting slabs of thickness d_1 and d_2 , and thermal conductivity K_1 and K_2 are placed together face to face as shown in figure in the steady state temperature of outer surfaces are theta_1 and theta_2 . The temperature of common surface is-

A thick cylindrical shell made of material of thermal conductivity k has inner and outer radii r and R respectively and its length is L. When the curved surface of the cylinder are lagged (i.e., given insulation cover) and one end is maintained at temperature T_(1) and the other end is maintained at T_(2)(lt T_(1)) , the heat current along the length of the cylinder is H. In another experiment the two ends are lagged and the inner wall and outer wall are maintained at T_(1) and T_(2) respectively. Find the radial heat flow in this case.

A spherical body of radius 'b' has a concentric cavity of radius 'a' as shown. Thermal conductivity of the material is K. Find thermal resistance between inner surface P and outer surface Q.

Consider a compound slab consisting of two different material having equal thickness and thermal conductivities K and 2K respectively. The equivalent thermal conductivity of the slab is

NTA MOCK TESTS-NTA NEET SET 43-PHYSICS
  1. A simple pendulum of length 1 m is oscillating with an angular freq...

    Text Solution

    |

  2. Acceleration due to gravity at earth's surface is 10 m ^(-2) The value...

    Text Solution

    |

  3. A composite spherical shell is made up to two materials having thermal...

    Text Solution

    |

  4. In a certain process, 400 cal of heat are supplied to a system and the...

    Text Solution

    |

  5. The magnetic field at the origin due to the current flowing in the wir...

    Text Solution

    |

  6. A very broad elevator is going up vertically with a constant accelerat...

    Text Solution

    |

  7. A shell of mass 10 kg is moving with a velocity with a velocity of 10m...

    Text Solution

    |

  8. Two lithium nuclei in a lithium vapour at room temperature do not comb...

    Text Solution

    |

  9. A point mass m = 20 kg, is suspended by a massless spring of constant ...

    Text Solution

    |

  10. The radiation corresponding to 3 rarr 2 transition of hydrogen atom f...

    Text Solution

    |

  11. A ball of radius r and density r falls freely under gravity through a ...

    Text Solution

    |

  12. A point object is placed at distance of 20 cm from a thin plane - con...

    Text Solution

    |

  13. For spheres each of mass M and radius R are placed with their centers ...

    Text Solution

    |

  14. The forbidden energy gap in Ge is 0.72 eV , given hc = 12440 eVÅ - Th...

    Text Solution

    |

  15. In the show indicator diagram over pressure - volume scales 'n' moles ...

    Text Solution

    |

  16. Dimensional formula of the physical quantity, resistance is

    Text Solution

    |

  17. In a Young's double slit experiment with light of wavelength lamda the...

    Text Solution

    |

  18. A stretched string of length L , fixed at both ends can sustain statio...

    Text Solution

    |

  19. A car weighing 1000 kg is going up an incline with a slope of 2 in 25 ...

    Text Solution

    |

  20. The amount of work done in moving a charge of 5 C across two points ha...

    Text Solution

    |