Home
Class 12
PHYSICS
Two rods A and B of different materials ...

Two rods A and B of different materials are welded together as shown in figure. Their thermal conductivities are `K_(1)` and `K_(2)`. The thermal conductivity of the composite rod will be

A

`(3(K_1 + K_2))/2`

B

`K_1 + K_2`

C

`2(K_1_K_2)`

D

`(K_1_+K_2)/2`

Text Solution

Verified by Experts

The correct Answer is:
D
Promotional Banner

Topper's Solved these Questions

  • HEAT TRANSFER & THERMAL EXPANSION

    MOTION|Exercise Exercise - 3 Section-B|19 Videos

  • HEAT TRANSFER & THERMAL EXPANSION

    MOTION|Exercise EXERCISE - 2|45 Videos

  • HEAT - 1

    MOTION|Exercise EXERCISE -4 (Level - II) Previous Year | JEE Advanced|22 Videos

  • HEAT-2

    MOTION|Exercise EXERCISE-4 (LEVEL-II)|30 Videos

Similar Questions

Explore conceptually related problems

The thermal conductivity of a rod depends on

A slab consists of two layers of different materials of the same thickness and having thermal conductivities K_(1) and K_(2) . The equivalent thermal conductivity of the slab is

A slab consists of two parallel layers of two different materials of same thickness having thermal conductivities K_(1) and K_(2) . The equivalent conductivity of the combination is

Two rods of the same length and diameter, having thermal conductivities K_(1) and K_(2) , are joined in parallel. The equivalent thermal conductivity to the combinationk is

A composite slab consists of two slabs A and B of different materials but of the same thickness placed one on top of the other. The thermal conductivities of A and B are k_(1) and K_(2) respectively. A steady temperature difference of 12^(@)C is maintained across the composite slab. If k_(1) = K_(2)//2 , the temperature difference across slab A will be:

Two slabs A and B of different materials but of the same thicknesss are joined end to end to form a composite slab. The thermal conductivities of A and B are K_(1) and K_(2) respectively. A steady temperature difference of 12^(@) C is maintained across the composite slab. If K_(1) = K_(2)/2 , the temperature difference across slabs A is

A wall has two layers A and B each made of different materials. The thickness of both the layers is the same. The thermal conductivity of A, K_(A) = 3K_(B) . The temperature different across the wall is 20^(@)C in thermal equilibrium

MOTION-HEAT TRANSFER & THERMAL EXPANSION -Exercise - 3 Section-A
  1. Three objects coloured black, gray and white can withstand hostile con...

    Text Solution

    |

  2. On a new scale of temperature (which is linear) and called the W scale...

    Text Solution

    |

  3. The two ends of a rod of length L and a uniform cross-sectional area A...

    Text Solution

    |

  4. A black body at 227^(@)C radiates heat at the rate of 7 cal cm^(-2) s...

    Text Solution

    |

  5. A cylindrical metallic rod in thermal contact with two reservoirs of h...

    Text Solution

    |

  6. The total radiant energy per unit area, normal to the direction of inc...

    Text Solution

    |

  7. A slab of stone of area of 0.36 m^(2) and thickness 0.1 m is exposed o...

    Text Solution

    |

  8. If the radius of a star is R and it acts as a black body, what would b...

    Text Solution

    |

  9. Assertion (A) A thermocouple refrigerator is based on the Peltier effe...

    Text Solution

    |

  10. A piece of iron is heated in a flame. It first becomes dull red then b...

    Text Solution

    |

  11. Two stars A and B of surface area Sa and Sb & temperature Ta and Tb gl...

    Text Solution

    |

  12. Certain quantity of water cools from 70^(@)C to 60^(@)C in the first 5...

    Text Solution

    |

  13. The two ends of a metal rod are maintained at temperatures 100^(@)C an...

    Text Solution

    |

  14. On observing light from three different stars P, Q and R, it was found...

    Text Solution

    |

  15. The value of coefficient of volume expansion of glycerin is 5 xx 10^(-...

    Text Solution

    |

  16. A body cool from 90^@C to 70^@C in 10 minutes if temperature of surrou...

    Text Solution

    |

  17. A black body is at a temperature of 5760 K. The energy of radiation em...

    Text Solution

    |

  18. Coefficient of liner expansion of brass and steel rods are alpha(1) an...

    Text Solution

    |

  19. Two rods A and B of different materials are welded together as shown i...

    Text Solution

    |

  20. The bulk modulus of a spherical object is B if it is subjected to unif...

    Text Solution

    |